diff --git a/changelog.txt b/changelog.txt
index 1a364ff62..89f518851 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -20,6 +20,7 @@ Template for new versions:
 
 ## Structures
 - name many previously-unknown map-related fields and flag bits
+- ``unit_action_data_attack`` (``unit_move_attackst``): identify flags
 
 # 50.12-r2.1