diff --git a/modules/ruby/README.md b/modules/ruby/README.md
index 1c955f5..372d00f 100644
--- a/modules/ruby/README.md
+++ b/modules/ruby/README.md
@@ -63,6 +63,7 @@ Aliases
 ### Bundler
 
   - `rbb` manages ruby dependencies (`bundle`).
+  - `rbbc` cleans up unused gems in your bundler directory.
   - `rbbe` executes a script in the context of the current bundle.
   - `rbbi` installs the gems specified in the *Gemfile* in *vendor/bundle*.
   - `rbbI` installs the following: