diff --git a/src/cameras/2d/BaseCamera.js b/src/cameras/2d/BaseCamera.js
index 7134714c5..78ba5f84f 100644
--- a/src/cameras/2d/BaseCamera.js
+++ b/src/cameras/2d/BaseCamera.js
@@ -1701,7 +1701,7 @@ var BaseCamera = new Class({
     },
 
     /**
-     * The x position of the center of the Camera's viewport, relative to the top-left of the game canvas.
+     * The horizontal position of the center of the Camera's viewport, relative to the left of the game canvas.
      *
      * @name Phaser.Cameras.Scene2D.BaseCamera#centerX
      * @type {number}
@@ -1718,7 +1718,7 @@ var BaseCamera = new Class({
     },
 
     /**
-     * The y position of the center of the Camera's viewport, relative to the top-left of the game canvas.
+     * The vertical position of the center of the Camera's viewport, relative to the top of the game canvas.
      *
      * @name Phaser.Cameras.Scene2D.BaseCamera#centerY
      * @type {number}
diff --git a/src/gameobjects/group/Group.js b/src/gameobjects/group/Group.js
index ab5663f6d..57f2ebc05 100644
--- a/src/gameobjects/group/Group.js
+++ b/src/gameobjects/group/Group.js
@@ -28,7 +28,7 @@ var Sprite = require('../sprite/Sprite');
 /**
  * @typedef {object} GroupConfig
  *
- * @property {?object} [classType=Sprite] - Sets {@link Phaser.GameObjects.Group#classType}.
+ * @property {?GroupClassTypeConstructor} [classType=Sprite] - Sets {@link Phaser.GameObjects.Group#classType}.
  * @property {?boolean} [active=true] - Sets {@link Phaser.GameObjects.Group#active}.
  * @property {?number} [maxSize=-1] - Sets {@link Phaser.GameObjects.Group#maxSize}.
  * @property {?string} [defaultKey=null] - Sets {@link Phaser.GameObjects.Group#defaultKey}.
@@ -52,7 +52,7 @@ var Sprite = require('../sprite/Sprite');
  *
  * `key` is required. {@link Phaser.GameObjects.Group#defaultKey} is not used.
  *
- * @property {?object} [classType] - The class of each new Game Object.
+ * @property {?GroupClassTypeConstructor} [classType] - The class of each new Game Object.
  * @property {string} [key] - The texture key of each new Game Object.
  * @property {?(string|integer)} [frame=null] - The texture frame of each new Game Object.
  * @property {?boolean} [visible=true] - The visible state of each new Game Object.
@@ -93,6 +93,18 @@ var Sprite = require('../sprite/Sprite');
  * @see Phaser.Utils.Array.Range
  */
 
+/**
+ * A constructor function (class) that can be assigned to `classType`.
+ * @callback GroupClassTypeConstructor
+ * @param {Phaser.Scene} scene - The Scene to which this Game Object belongs. A Game Object can only belong to one Scene at a time.
+ * @param {number} x - The horizontal position of this Game Object in the world.
+ * @param {number} y - The vertical position of this Game Object in the world.
+ * @param {string} texture - The key of the Texture this Game Object will use to render with, as stored in the Texture Manager.
+ * @param {(string|integer)} [frame] - An optional frame from the Texture this Game Object is rendering with.
+ *
+ * @see Phaser.GameObjects.Group#classType
+ */
+
 /**
  * @classdesc A Group is a way for you to create, manipulate, or recycle similar Game Objects.
  *
@@ -185,7 +197,7 @@ var Group = new Class({
          * The class to create new group members from.
          *
          * @name Phaser.GameObjects.Group#classType
-         * @type {object}
+         * @type {GroupClassTypeConstructor}
          * @since 3.0.0
          * @default Phaser.GameObjects.Sprite
          */
diff --git a/src/physics/arcade/ArcadeImage.js b/src/physics/arcade/ArcadeImage.js
index 310eb9dfc..13e7ae587 100644
--- a/src/physics/arcade/ArcadeImage.js
+++ b/src/physics/arcade/ArcadeImage.js
@@ -10,12 +10,10 @@ var Image = require('../../gameobjects/image/Image');
 
 /**
  * @classdesc
- * An Arcade Physics Image Game Object.
+ * An Arcade Physics Image is an Image with an Arcade Physics body and related components.
+ * The body can be dynamic or static.
  *
- * An Image is a light-weight Game Object useful for the display of static images in your game,
- * such as logos, backgrounds, scenery or other non-animated elements. Images can have input
- * events and physics bodies, or be tweened, tinted or scrolled. The main difference between an
- * Image and a Sprite is that you cannot animate an Image as they do not have the Animation component.
+ * The main difference between an Arcade Image and an Arcade Sprite is that you cannot animate an Arcade Image.
  *
  * @class Image
  * @extends Phaser.GameObjects.Image
diff --git a/src/physics/arcade/ArcadeSprite.js b/src/physics/arcade/ArcadeSprite.js
index bddb664fe..cd5954ae6 100644
--- a/src/physics/arcade/ArcadeSprite.js
+++ b/src/physics/arcade/ArcadeSprite.js
@@ -10,15 +10,11 @@ var Sprite = require('../../gameobjects/sprite/Sprite');
 
 /**
  * @classdesc
- * An Arcade Physics Sprite Game Object.
+ * An Arcade Physics Sprite is a Sprite with an Arcade Physics body and related components.
+ * The body can be dynamic or static.
  *
- * A Sprite Game Object is used for the display of both static and animated images in your game.
- * Sprites can have input events and physics bodies. They can also be tweened, tinted, scrolled
- * and animated.
- *
- * The main difference between a Sprite and an Image Game Object is that you cannot animate Images.
- * As such, Sprites take a fraction longer to process and have a larger API footprint due to the Animation
- * Component. If you do not require animation then you can safely use Images to replace Sprites in all cases.
+ * The main difference between an Arcade Sprite and an Arcade Image is that you cannot animate an Arcade Image.
+ * If you do not require animation then you can safely use Arcade Images instead of Arcade Sprites.
  *
  * @class Sprite
  * @extends Phaser.GameObjects.Sprite
diff --git a/src/physics/arcade/Body.js b/src/physics/arcade/Body.js
index 52586f9f6..b2ccf4810 100644
--- a/src/physics/arcade/Body.js
+++ b/src/physics/arcade/Body.js
@@ -623,7 +623,7 @@ var Body = new Class({
         this.overlapR = 0;
 
         /**
-         * Whether this Body is overlapped with another and both have zero velocity.
+         * Whether this Body is overlapped with another and both are not moving.
          *
          * @name Phaser.Physics.Arcade.Body#embedded
          * @type {boolean}
@@ -718,6 +718,7 @@ var Body = new Class({
          * @name Phaser.Physics.Arcade.Body#physicsType
          * @type {integer}
          * @readonly
+         * @default Phaser.Physics.Arcade.DYNAMIC_BODY
          * @since 3.0.0
          */
         this.physicsType = CONST.DYNAMIC_BODY;
@@ -787,7 +788,8 @@ var Body = new Class({
     },
 
     /**
-     * Updates this Body's transform, dimensions, and position from its Game Object.
+     * Updates the Body's `transform`, `width`, `height`, and `center` from its Game Object.
+     * The Body's `position` isn't changed.
      *
      * @method Phaser.Physics.Arcade.Body#updateBounds
      * @since 3.0.0
@@ -874,7 +876,7 @@ var Body = new Class({
      * @fires Phaser.Physics.Arcade.World#worldbounds
      * @since 3.0.0
      *
-     * @param {number} delta - The delta time, in ms, elapsed since the last frame.
+     * @param {number} delta - The delta time, in seconds, elapsed since the last frame.
      */
     update: function (delta)
     {
diff --git a/src/physics/arcade/Collider.js b/src/physics/arcade/Collider.js
index 22f05239e..5a35ecbc7 100644
--- a/src/physics/arcade/Collider.js
+++ b/src/physics/arcade/Collider.js
@@ -40,7 +40,7 @@ var Collider = new Class({
         this.world = world;
 
         /**
-         * The name of the collider (unused by phaser).
+         * The name of the collider (unused by Phaser).
          *
          * @name Phaser.Physics.Arcade.Collider#name
          * @type {string}
diff --git a/src/physics/arcade/Factory.js b/src/physics/arcade/Factory.js
index b93b6e433..ac87f1005 100644
--- a/src/physics/arcade/Factory.js
+++ b/src/physics/arcade/Factory.js
@@ -58,7 +58,7 @@ var Factory = new Class({
     },
 
     /**
-     * Create a new Arcade Physics Collider object.
+     * Creates a new Arcade Physics Collider object.
      *
      * @method Phaser.Physics.Arcade.Factory#collider
      * @since 3.0.0
@@ -77,7 +77,7 @@ var Factory = new Class({
     },
 
     /**
-     * Create a new Arcade Physics Collider Overlap object.
+     * Creates a new Arcade Physics Collider Overlap object.
      *
      * @method Phaser.Physics.Arcade.Factory#overlap
      * @since 3.0.0
diff --git a/src/physics/arcade/PhysicsGroup.js b/src/physics/arcade/PhysicsGroup.js
index 963b6df4b..5d090b823 100644
--- a/src/physics/arcade/PhysicsGroup.js
+++ b/src/physics/arcade/PhysicsGroup.js
@@ -154,7 +154,7 @@ var PhysicsGroup = new Class({
          *
          * @name Phaser.Physics.Arcade.Group#physicsType
          * @type {integer}
-         * @default DYNAMIC_BODY
+         * @default Phaser.Physics.Arcade.DYNAMIC_BODY
          * @since 3.0.0
          */
         this.physicsType = CONST.DYNAMIC_BODY;
diff --git a/src/physics/arcade/StaticBody.js b/src/physics/arcade/StaticBody.js
index 92e0a348a..2891788c6 100644
--- a/src/physics/arcade/StaticBody.js
+++ b/src/physics/arcade/StaticBody.js
@@ -219,10 +219,12 @@ var StaticBody = new Class({
         //  If true this Body will dispatch events
 
         /**
-         * Whether the simulation emits a `worldbounds` event when this StaticBody collides with the world boundary (and `collideWorldBounds` is also true).
+         * Whether the simulation emits a `worldbounds` event when this StaticBody collides with the world boundary.
+         * Always false for a Static Body. (Static Bodies never collide with the world boundary and never trigger a `worldbounds` event.)
          *
          * @name Phaser.Physics.Arcade.StaticBody#onWorldBounds
          * @type {boolean}
+         * @readonly
          * @default false
          * @since 3.0.0
          */
@@ -269,7 +271,7 @@ var StaticBody = new Class({
         this.immovable = true;
 
         /**
-         * A flag disabling the default horizontal separation of colliding bodies. Pass your own `processHandler` to the collider.
+         * A flag disabling the default horizontal separation of colliding bodies. Pass your own `collideHandler` to the collider.
          *
          * @name Phaser.Physics.Arcade.StaticBody#customSeparateX
          * @type {boolean}
@@ -279,7 +281,7 @@ var StaticBody = new Class({
         this.customSeparateX = false;
 
         /**
-         * A flag disabling the default vertical separation of colliding bodies. Pass your own `processHandler` to the collider.
+         * A flag disabling the default vertical separation of colliding bodies. Pass your own `collideHandler` to the collider.
          *
          * @name Phaser.Physics.Arcade.StaticBody#customSeparateY
          * @type {boolean}
@@ -319,7 +321,7 @@ var StaticBody = new Class({
         this.overlapR = 0;
 
         /**
-         * Whether this StaticBody is overlapped with another and both have zero velocity.
+         * Whether this StaticBody has ever overlapped with another while both were not moving.
          *
          * @name Phaser.Physics.Arcade.StaticBody#embedded
          * @type {boolean}
@@ -330,9 +332,11 @@ var StaticBody = new Class({
 
         /**
          * Whether this StaticBody interacts with the world boundary.
+         * Always false for a Static Body. (Static Bodies never collide with the world boundary.)
          *
          * @name Phaser.Physics.Arcade.StaticBody#collideWorldBounds
          * @type {boolean}
+         * @readonly
          * @default false
          * @since 3.0.0
          */
@@ -348,7 +352,7 @@ var StaticBody = new Class({
         this.checkCollision = { none: false, up: true, down: true, left: true, right: true };
 
         /**
-         * Whether this StaticBody is colliding with another and in which direction.
+         * Whether this StaticBody has ever collided with another body and in which direction.
          *
          * @name Phaser.Physics.Arcade.StaticBody#touching
          * @type {ArcadeBodyCollision}
@@ -357,7 +361,7 @@ var StaticBody = new Class({
         this.touching = { none: true, up: false, down: false, left: false, right: false };
 
         /**
-         * Whether this StaticBody was colliding with another during the last step, and in which direction.
+         * Whether this StaticBody was colliding with another body during the last step or any previous step, and in which direction.
          *
          * @name Phaser.Physics.Arcade.StaticBody#wasTouching
          * @type {ArcadeBodyCollision}
@@ -366,7 +370,7 @@ var StaticBody = new Class({
         this.wasTouching = { none: true, up: false, down: false, left: false, right: false };
 
         /**
-         * Whether this StaticBody is colliding with a tile or the world boundary.
+         * Whether this StaticBody has ever collided with a tile or the world boundary.
          *
          * @name Phaser.Physics.Arcade.StaticBody#blocked
          * @type {ArcadeBodyCollision}
@@ -379,6 +383,7 @@ var StaticBody = new Class({
          *
          * @name Phaser.Physics.Arcade.StaticBody#physicsType
          * @type {integer}
+         * @default Phaser.Physics.Arcade.STATIC_BODY
          * @since 3.0.0
          */
         this.physicsType = CONST.STATIC_BODY;
diff --git a/src/physics/arcade/StaticPhysicsGroup.js b/src/physics/arcade/StaticPhysicsGroup.js
index 4e240337f..796efa125 100644
--- a/src/physics/arcade/StaticPhysicsGroup.js
+++ b/src/physics/arcade/StaticPhysicsGroup.js
@@ -86,7 +86,7 @@ var StaticPhysicsGroup = new Class({
          *
          * @name Phaser.Physics.Arcade.StaticGroup#physicsType
          * @type {integer}
-         * @default STATIC_BODY
+         * @default Phaser.Physics.Arcade.STATIC_BODY
          * @since 3.0.0
          */
         this.physicsType = CONST.STATIC_BODY;
diff --git a/src/physics/arcade/World.js b/src/physics/arcade/World.js
index 5b0a2da84..5eeeb4ad8 100644
--- a/src/physics/arcade/World.js
+++ b/src/physics/arcade/World.js
@@ -1057,12 +1057,12 @@ var World = new Class({
     },
 
     /**
-     * Advances the simulation by one step.
+     * Advances the simulation by a time increment.
      *
      * @method Phaser.Physics.Arcade.World#step
      * @since 3.10.0
      *
-     * @param {number} delta - The delta time amount, in ms, by which to advance the simulation.
+     * @param {number} delta - The delta time amount, in seconds, by which to advance the simulation.
      */
     step: function (delta)
     {
@@ -1201,7 +1201,7 @@ var World = new Class({
      * @since 3.0.0
      *
      * @param {Phaser.Physics.Arcade.Body} body - The Body to be updated.
-     * @param {number} delta - The delta value to be used in the motion calculations.
+     * @param {number} delta - The delta value to be used in the motion calculations, in seconds.
      */
     updateMotion: function (body, delta)
     {
@@ -1220,7 +1220,7 @@ var World = new Class({
      * @since 3.10.0
      *
      * @param {Phaser.Physics.Arcade.Body} body - The Body to compute the velocity for.
-     * @param {number} delta - The delta value to be used in the calculation.
+     * @param {number} delta - The delta value to be used in the calculation, in seconds.
      */
     computeAngularVelocity: function (body, delta)
     {
@@ -1266,7 +1266,7 @@ var World = new Class({
      * @since 3.0.0
      *
      * @param {Phaser.Physics.Arcade.Body} body - The Body to compute the velocity for.
-     * @param {number} delta - The delta value to be used in the calculation.
+     * @param {number} delta - The delta value to be used in the calculation, in seconds.
      */
     computeVelocity: function (body, delta)
     {