diff --git a/scripts/dev/update_3rdparty.py b/scripts/dev/update_3rdparty.py
index 24f9432df..4b88b165f 100755
--- a/scripts/dev/update_3rdparty.py
+++ b/scripts/dev/update_3rdparty.py
@@ -97,6 +97,10 @@ def update_dmg_makefile():
 
 
 def update_ace():
+    """Update ACE.
+
+    See https://ace.c9.io/ and https://github.com/ajaxorg/ace-builds/
+    """
     print("Updating ACE...")
     url = 'https://raw.githubusercontent.com/ajaxorg/ace-builds/master/src/ace.js'
     target_path = os.path.join('tests', 'end2end', 'data', 'hints', 'ace',