diff --git a/docs/extending/rules.md b/docs/extending/rules.md
index 2c63e0d030..8b09985270 100644
--- a/docs/extending/rules.md
+++ b/docs/extending/rules.md
@@ -168,6 +168,7 @@ The button will be visible only when the linked rule evaluates to `true`.
 | 1.8.0 | user.isAdmin                        | Checks if user is admin.                                                 |
 | 1.9.0 | app.canShowLogout                   | Whether logout action should be present or not.                          |
 | 1.12.0 | app.isLibraryManager               | Checks if user is library manager.                                       |
+| 4.4.0 | canClosePreview                     | Conditionally show/hide the right side viewer close button.              |                                    
 
 ## Navigation Evaluators