diff --git a/docs/RAILS.md b/docs/RAILS.md
index 4e585268..e34b3dc3 100644
--- a/docs/RAILS.md
+++ b/docs/RAILS.md
@@ -23,6 +23,12 @@ Import Bootstrap in an SCSS file (for example, `application.css.scss`) to get al
 @import "bootstrap";
 ```
 
+You can also include optional bootstrap theme:
+
+```css
+@import "bootstrap/theme";
+```
+
 ### Javascripts
 
 We have a helper that includes all Bootstrap javascripts. Put this in your Javascript manifest (usually in `application.js`) to 
@@ -41,4 +47,4 @@ You can also load individual modules, provided you also require any dependencies
 ```
 
 [antirequire]: https://github.com/thomas-mcdonald/bootstrap-sass/issues/79#issuecomment-4428595
-[jsdocs]: http://getbootstrap.com/javascript/#transitions
\ No newline at end of file
+[jsdocs]: http://getbootstrap.com/javascript/#transitions