diff --git a/common/static/js/vendor/CodeMirror/codemirror.js b/common/static/js/vendor/CodeMirror/codemirror.js
index ff127f80f6..d345d64a26 100644
--- a/common/static/js/vendor/CodeMirror/codemirror.js
+++ b/common/static/js/vendor/CodeMirror/codemirror.js
@@ -1,3 +1,5 @@
+// CodeMirror version 2.23 (with edits)
+//
 // All functions that need access to the editor's state live inside
 // the CodeMirror function. Below that, at the bottom of the file,
 // some utilities are defined.