diff --git a/CHANGELOG.md b/CHANGELOG.md
index e0fb068..51ecae2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@
   so that multi-argumnet options can use different conversion rules
   for different arguments (#14).
 * Mutexes can now include positional arguments (#11).
+* Added `hidden` property for arguments, options and commands,
+  removing them from the autogenerated usage and help strings.
 
 ## 0.5.0 (2015-12-09)