diff --git a/src/govuk/helpers/_colour.scss b/src/govuk/helpers/_colour.scss
index 3535befa7e..f5deb609a6 100644
--- a/src/govuk/helpers/_colour.scss
+++ b/src/govuk/helpers/_colour.scss
@@ -75,7 +75,7 @@
 /// Make a colour darker by mixing it with black
 ///
 /// @param {Colour} $colour - colour to shade
-/// @param {Number} $percentage - percentage of `$colour` in returned color
+/// @param {Number} $percentage - percentage of `$colour` in returned colour
 /// @return {Colour}
 /// @access public
 
@@ -86,7 +86,7 @@
 /// Make a colour lighter by mixing it with white
 ///
 /// @param {Colour} $colour - colour to tint
-/// @param {Number} $percentage - percentage of `$colour` in returned color
+/// @param {Number} $percentage - percentage of `$colour` in returned colour
 /// @return {Colour}
 /// @access public