diff --git a/README.md b/README.md
index 633d140..1727531 100644
--- a/README.md
+++ b/README.md
@@ -40,7 +40,7 @@ fn main() {
 }
 ```
 
-If you wish to customize the way sizes are displayed, you may create your own custom `FileSizeOpts` struct
+If you wish to customize the way sizes are displayed, you may create your own custom `FormatSizeOptions` struct
 and pass that to the method. See the `custom_options.rs` file in the example folder.
 
 
diff --git a/examples/custom_options.rs b/examples/custom_options.rs
index a957a88..217b214 100644
--- a/examples/custom_options.rs
+++ b/examples/custom_options.rs
@@ -3,7 +3,7 @@ use humansize::{file_size_opts as opts, FileSize};
 
 fn main() {
     // Declare a fully custom option struct
-    let custom_options = opts::FileSizeOpts {
+    let custom_options = opts::FormatSizeOptions {
         divider: opts::Kilo::Binary,
         units: opts::Kilo::Decimal,
         decimal_places: 3,
@@ -18,7 +18,7 @@ fn main() {
     println!("{}", 3024.file_size(custom_options).unwrap());
 
     // Or use only some custom parameters and adopt the rest from an existing config
-    let semi_custom_options = opts::FileSizeOpts {
+    let semi_custom_options = opts::FormatSizeOptions {
         decimal_zeroes: 3,
         ..opts::DECIMAL
     };
diff --git a/src/file_size_opts/defaults.rs b/src/file_size_opts/defaults.rs
index 8860c44..2d7bdd9 100644
--- a/src/file_size_opts/defaults.rs
+++ b/src/file_size_opts/defaults.rs
@@ -1,7 +1,7 @@
-use crate::file_size_opts::{FileSizeOpts, FixedAt, Kilo};
+use crate::file_size_opts::{FormatSizeOptions, FixedAt, Kilo};
 
 /// Options to display sizes in the binary format.
-pub const BINARY: FileSizeOpts = FileSizeOpts {
+pub const BINARY: FormatSizeOptions = FormatSizeOptions {
     divider: Kilo::Binary,
     units: Kilo::Binary,
     decimal_places: 2,
@@ -10,11 +10,10 @@ pub const BINARY: FileSizeOpts = FileSizeOpts {
     long_units: false,
     space: true,
     suffix: "",
-    allow_negative: false,
 };
 
 /// Options to display sizes in the decimal format.
-pub const DECIMAL: FileSizeOpts = FileSizeOpts {
+pub const DECIMAL: FormatSizeOptions = FormatSizeOptions {
     divider: Kilo::Decimal,
     units: Kilo::Decimal,
     decimal_places: 2,
@@ -23,12 +22,11 @@ pub const DECIMAL: FileSizeOpts = FileSizeOpts {
     long_units: false,
     space: true,
     suffix: "",
-    allow_negative: false,
 };
 
 /// Options to display sizes in the "conventional" format.
 /// This 1024 as the value of the `Kilo`, but displays decimal-style units (`KB`, not `KiB`).
-pub const CONVENTIONAL: FileSizeOpts = FileSizeOpts {
+pub const CONVENTIONAL: FormatSizeOptions = FormatSizeOptions {
     divider: Kilo::Binary,
     units: Kilo::Decimal,
     decimal_places: 2,
@@ -37,5 +35,4 @@ pub const CONVENTIONAL: FileSizeOpts = FileSizeOpts {
     long_units: false,
     space: true,
     suffix: "",
-    allow_negative: false,
 };
diff --git a/src/file_size_opts/mod.rs b/src/file_size_opts/mod.rs
index 0901678..c514c89 100644
--- a/src/file_size_opts/mod.rs
+++ b/src/file_size_opts/mod.rs
@@ -6,7 +6,7 @@ pub mod defaults;
 pub use self::defaults::*;
 
 #[derive(Debug, PartialEq, Copy, Clone)]
-/// Holds the standard to use when displying the size.
+/// Holds the standard to use when displaying the size.
 pub enum Kilo {
     /// The decimal scale and units
     Decimal,
@@ -31,7 +31,7 @@ pub enum FixedAt {
 
 /// Holds the options for the `file_size` method.
 #[derive(Debug)]
-pub struct FileSizeOpts {
+pub struct FormatSizeOptions {
     /// The scale (binary/decimal) to divide against.
     pub divider: Kilo,
 
@@ -47,7 +47,7 @@ pub struct FileSizeOpts {
     /// Whether to force a certain representation and if so, which one.
     pub fixed_at: FixedAt,
 
-    /// Whether to use the full suffix or its abbreveation.
+    /// Whether to use the full suffix or its abbreviation.
     pub long_units: bool,
 
     /// Whether to place a space between value and units.
@@ -55,13 +55,10 @@ pub struct FileSizeOpts {
 
     /// An optional suffix which will be appended after the unit.
     pub suffix: &'static str,
-
-    /// Whether to allow negative numbers as input. If `False`, negative values will return an error.
-    pub allow_negative: bool,
 }
 
-impl AsRef<FileSizeOpts> for FileSizeOpts {
-    fn as_ref(&self) -> &FileSizeOpts {
+impl AsRef<FormatSizeOptions> for FormatSizeOptions {
+    fn as_ref(&self) -> &FormatSizeOptions {
         self
     }
 }
diff --git a/tests/test.rs b/tests/test.rs
index 020988f..42aa53f 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -14,32 +14,32 @@ fn test_sizes() {
     assert_eq!(1024.file_size(BINARY).unwrap(), "1 KiB");
     assert_eq!(1024.file_size(CONVENTIONAL).unwrap(), "1 KB");
 
-    let semi_custom_options = file_size_opts::FileSizeOpts {
+    let semi_custom_options = file_size_opts::FormatSizeOptions {
         space: false,
         ..file_size_opts::DECIMAL
     };
     assert_eq!(1000.file_size(semi_custom_options).unwrap(), "1KB");
 
-    let semi_custom_options2 = file_size_opts::FileSizeOpts {
+    let semi_custom_options2 = file_size_opts::FormatSizeOptions {
         suffix: "/s",
         ..file_size_opts::BINARY
     };
     assert_eq!(999.file_size(semi_custom_options2).unwrap(), "999 B/s");
 
-    let semi_custom_options3 = file_size_opts::FileSizeOpts {
+    let semi_custom_options3 = file_size_opts::FormatSizeOptions {
         suffix: "/day",
         space: false,
         ..file_size_opts::DECIMAL
     };
     assert_eq!(1000.file_size(semi_custom_options3).unwrap(), "1KB/day");
 
-    let semi_custom_options4 = file_size_opts::FileSizeOpts {
+    let semi_custom_options4 = file_size_opts::FormatSizeOptions {
         fixed_at: file_size_opts::FixedAt::Byte,
         ..file_size_opts::BINARY
     };
     assert_eq!(2048.file_size(semi_custom_options4).unwrap(), "2048 B");
 
-    let semi_custom_options5 = file_size_opts::FileSizeOpts {
+    let semi_custom_options5 = file_size_opts::FormatSizeOptions {
         fixed_at: file_size_opts::FixedAt::Kilo,
         ..file_size_opts::BINARY
     };
@@ -48,7 +48,7 @@ fn test_sizes() {
         "16196.26 KiB"
     );
 
-    let semi_custom_options6 = file_size_opts::FileSizeOpts {
+    let semi_custom_options6 = file_size_opts::FormatSizeOptions {
         fixed_at: file_size_opts::FixedAt::Tera,
         decimal_places: 10,
         ..file_size_opts::BINARY
@@ -58,7 +58,7 @@ fn test_sizes() {
         "0.0000139016 TiB"
     );
 
-    let semi_custom_options7 = file_size_opts::FileSizeOpts {
+    let semi_custom_options7 = file_size_opts::FormatSizeOptions {
         allow_negative: true,
         ..file_size_opts::DECIMAL
     };
@@ -71,7 +71,7 @@ fn test_sizes() {
 
 #[test]
 fn use_custom_option_struct_twice() {
-    let options = file_size_opts::FileSizeOpts {
+    let options = file_size_opts::FormatSizeOptions {
         long_units: true,
         ..file_size_opts::DECIMAL
     };
@@ -83,7 +83,7 @@ fn use_custom_option_struct_twice() {
 
 #[test]
 fn pluralization_works() {
-    let options = file_size_opts::FileSizeOpts {
+    let options = file_size_opts::FormatSizeOptions {
         long_units: true,
         decimal_zeroes: 2,
         ..file_size_opts::DECIMAL
@@ -115,7 +115,7 @@ fn pluralization_works() {
 
 #[test]
 fn max_value_decimal() {
-    let options = file_size_opts::FileSizeOpts {
+    let options = file_size_opts::FormatSizeOptions {
         long_units: true,
         decimal_places: 7,
         ..file_size_opts::DECIMAL
@@ -129,7 +129,7 @@ fn max_value_decimal() {
 
 #[test]
 fn max_value_binary() {
-    let options = file_size_opts::FileSizeOpts {
+    let options = file_size_opts::FormatSizeOptions {
         long_units: true,
         decimal_places: 7,
         ..file_size_opts::BINARY