diff --git a/v3/src/gameobjects/tilemap/components/CalculateFacesWithin.js b/v3/src/gameobjects/tilemap/components/CalculateFacesWithin.js
index 5b8bd4f86..2f29e6701 100644
--- a/v3/src/gameobjects/tilemap/components/CalculateFacesWithin.js
+++ b/v3/src/gameobjects/tilemap/components/CalculateFacesWithin.js
@@ -1,6 +1,17 @@
 var GetTileAt = require('./GetTileAt');
 var GetTilesWithin = require('./GetTilesWithin');
 
+/**
+ * Calculates interesting faces within the rectangular area specified (in tile coordinates).
+ * Interesting faces are used internally for optimizing collisions against tiles. This method is
+ * mostly used internally.
+ *
+ * @param {number} [tileX=0] - [description]
+ * @param {number} [tileY=0] - [description]
+ * @param {number} [width=max width based on tileX] - [description]
+ * @param {number} [height=max height based on tileY] - [description]
+ * @param {LayerData} layer - [description]
+ */
 var CalculateFacesWithin = function (tileX, tileY, width, height, layer)
 {
     var above = null;
diff --git a/v3/src/gameobjects/tilemap/components/Copy.js b/v3/src/gameobjects/tilemap/components/Copy.js
index 30145cf40..e9b7ac420 100644
--- a/v3/src/gameobjects/tilemap/components/Copy.js
+++ b/v3/src/gameobjects/tilemap/components/Copy.js
@@ -1,7 +1,22 @@
 var GetTilesWithin = require('./GetTilesWithin');
 var CalculateFacesWithin = require('./CalculateFacesWithin');
 
-// Copies indices, not other properties. Does not modify collisions.
+/**
+ * Copies the tiles in the source rectangular area to a new destination (all specified in tile
+ * coordinates). This copies all tile properties & recalculates interesting tile faces in the
+ * destination region.
+ *
+ * @param {number} srcTileX - [description]
+ * @param {number} srcTileY - [description]
+ * @param {number} width - [description]
+ * @param {number} height - [description]
+ * @param {number} destTileX - [description]
+ * @param {number} destTileY - [description]
+ * @param {number} destTileY - [description]
+ * @param {boolean} [recalculateFaces=true] - [description]
+ * @param {LayerData} layer - [description]
+ */
+
 var Copy = function (srcTileX, srcTileY, width, height, destTileX, destTileY, recalculateFaces, layer)
 {
     if (srcTileX < 0) { srcTileX = 0; }
diff --git a/v3/src/gameobjects/tilemap/components/CullTiles.js b/v3/src/gameobjects/tilemap/components/CullTiles.js
index fddc3679b..4246ce3aa 100644
--- a/v3/src/gameobjects/tilemap/components/CullTiles.js
+++ b/v3/src/gameobjects/tilemap/components/CullTiles.js
@@ -1,3 +1,12 @@
+/**
+ * Returns the tiles in the given layer that are within the camera's viewport. This is used
+ * internally.
+ *
+ * @param {LayerData} layer - [description]
+ * @param {Camera} camera - [description]
+ * @param {array} [outputArray] - [description]
+ * @returns {array}
+ */
 var CullTiles = function (layer, camera, outputArray)
 {
     if (outputArray === undefined) { outputArray = []; }
diff --git a/v3/src/gameobjects/tilemap/components/GetTilesWithinShape.js b/v3/src/gameobjects/tilemap/components/GetTilesWithinShape.js
index d04673d75..abe016c8a 100644
--- a/v3/src/gameobjects/tilemap/components/GetTilesWithinShape.js
+++ b/v3/src/gameobjects/tilemap/components/GetTilesWithinShape.js
@@ -14,8 +14,8 @@ var TriangleToRectangle = function (triangle, rect)
 };
 
 // Circle, Line, Rect, Triangle in world coordinates.
-// Notes: circle is not working yet - see CircleToRectangle in geom. Could possibly be optimized
-// by copying the shape and shifting it into tilemapLayer coordinates instead of shifting the tiles.
+// Note: Could possibly be optimized by copying the shape and shifting it into tilemapLayer
+// coordinates instead of shifting the tiles.
 var GetTilesWithinShape = function (shape, filteringOptions, camera, layer)
 {
     if (shape === undefined) { return []; }