diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 8bb3ccde0c..03c047782f 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -35,7 +35,7 @@ Our bug tracker utilizes several labels to help organize and identify issues. He
 
 - `browser bug` - Issues that are reported to us, but actually are the result of a browser-specific bug. These are diagnosed with reduced test cases and result in an issue opened on that browser's own bug tracker.
 - `confirmed` - Issues that have been confirmed with a reduced test case and identify a bug in Bootstrap.
-- `css` - Issues stemming from our compiled CSS or source Less files.
+- `css` - Issues stemming from our compiled CSS or source Sass files.
 - `docs` - Issues for improving or updating our documentation.
 - `examples` - Issues involving the example templates included in our docs.
 - `feature` - Issues asking for a new feature to be added, or an existing one to be extended or modified. New features require a minor version bump (e.g., `v3.0.0` to `v3.1.0`).
@@ -136,7 +136,7 @@ project (indentation, accurate comments, etc.) and any other requirements
 
 **Do not edit `bootstrap.css`, `bootstrap-theme.css`, or `bootstrap.js`
 directly!** Those files are automatically generated. You should edit the
-source files in [`/bootstrap/less/`](https://github.com/twbs/bootstrap/tree/master/less)
+source files in [`/bootstrap/scss/`](https://github.com/twbs/bootstrap/tree/master/scss)
 and/or [`/bootstrap/js/`](https://github.com/twbs/bootstrap/tree/master/js) instead.
 
 Similarly, when contributing to Bootstrap's documentation, you should edit the
diff --git a/docs/components/collapse.md b/docs/components/collapse.md
index 440d374368..40050c29fc 100644
--- a/docs/components/collapse.md
+++ b/docs/components/collapse.md
@@ -96,7 +96,7 @@ The collapse plugin utilizes a few classes to handle the heavy lifting:
 - `.collapse.in` shows the content
 - `.collapsing` is added when the transition starts, and removed when it finishes
 
-These classes can be found in `component-animations.less`.
+These classes can be found in `_animation.scss`.
 
 ### Via data attributes
 
diff --git a/docs/getting-started/download.md b/docs/getting-started/download.md
index 7255fbba5b..aa9834e478 100644
--- a/docs/getting-started/download.md
+++ b/docs/getting-started/download.md
@@ -52,7 +52,7 @@ Install Bootstrap in your Node powered apps with [the npm package](https://www.n
 
 Bootstrap's `package.json` contains some additional metadata under the following keys:
 
-- `less` - path to Bootstrap's main [Less](http://lesscss.org) source file
+- `sass` - path to Bootstrap's main [Sass](http://sass-lang.com/) source file
 - `style` - path to Bootstrap's non-minified CSS that's been precompiled using the default settings (no customization)
 
 ### Meteor
diff --git a/scss/_forms.scss b/scss/_forms.scss
index 72ec9b03f9..f8ffed37ec 100644
--- a/scss/_forms.scss
+++ b/scss/_forms.scss
@@ -384,7 +384,7 @@ input[type="checkbox"] {
 // Requires wrapping inputs and labels with `.form-group` for proper display of
 // default HTML form controls and our custom form controls (e.g., input groups).
 //
-// Heads up! This is mixin-ed into `.navbar-form` in navbars.less.
+// Heads up! This is mixin-ed into `.navbar-form` in _navbar.scss.
 
 .form-inline {