diff --git a/doc/changelog.rst b/doc/changelog.rst
index e304a2e325c437540687bc8952170a17236b2c24..7acb0c620875578a897808e0755ffce6fe561560 100644
--- a/doc/changelog.rst
+++ b/doc/changelog.rst
@@ -10,6 +10,7 @@ unreleased
  
 - **Improvements**
 
+    - update GATT-related mnemonics, add `transmission_col2` :mr:`172`
     - reorganize the Howto section :mr:`169`
   
 - **New Features**