diff --git a/doc/CASK_LANGUAGE_REFERENCE.md b/doc/CASK_LANGUAGE_REFERENCE.md
index dcf17731044..4aff0c3cefa 100644
--- a/doc/CASK_LANGUAGE_REFERENCE.md
+++ b/doc/CASK_LANGUAGE_REFERENCE.md
@@ -573,6 +573,16 @@ installer :script => 'Adobe AIR Installer.app/Contents/MacOS/Adobe AIR Installer
 `depends_on` is used to declare dependencies and requirements for a Cask.
 `depends_on` is not consulted until `install` is attempted.
 
+### Depends_on :cask
+
+The value should be another Cask token, needed by the current Cask.
+
+Example use: [`SSHFS`](https://github.com/caskroom/homebrew-cask/blob/master/Casks/sshfs.rb) depends on OSXFUSE.
+
+```ruby
+depends_on :cask => 'osxfuse'
+```
+
 ### Depends_on :formula
 
 The value should name a Homebrew Formula needed by the Cask.
@@ -668,7 +678,7 @@ depends_on :arch => :x86_64
 | key        | description |
 | ---------- | ----------- |
 | `:formula` | a Homebrew Formula
-| `:cask`    | *stub - not yet functional*
+| `:cask`    | a Cask token
 | `:macos`   | a symbol, string, array, or comparison expression defining OS X release requirements.
 | `:arch`    | a symbol or array defining hardware requirements.
 | `:x11`     | a Boolean indicating a dependency on X11.
diff --git a/doc/cask_language_deltas.md b/doc/cask_language_deltas.md
index a621f99213a..0ce11a658ee 100644
--- a/doc/cask_language_deltas.md
+++ b/doc/cask_language_deltas.md
@@ -46,7 +46,6 @@ features which are available for the current Cask.
  * [`appcast`](CASK_LANGUAGE_REFERENCE.md#appcast-stanza-details)
  * [`artifact`](CASK_LANGUAGE_REFERENCE.md#at-least-one-artifact-stanza-is-also-required)
  * [`depends_on :cask`](CASK_LANGUAGE_REFERENCE.md#depends_on-stanza-details)
-   * *stub* - not yet functional
  * [`depends_on :java`](CASK_LANGUAGE_REFERENCE.md#depends_on-stanza-details)
    * *stub* - not yet functional
  * [`conflicts_with`](CASK_LANGUAGE_REFERENCE.md#conflicts_with-stanza-details)