diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index e004010..b6e5023 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -301,6 +301,7 @@
 |FileChangedShellPost|	After handling a file changed since editing started
 |FileChangedRO|		before making the first change to a read-only file
 
+|DiffUpdated|		after diffs have been updated
 |DirChanged|		after the working directory has changed
 
 |ShellCmdPost|		after executing a shell command