diff --git a/scripts/gen_vimdoc.py b/scripts/gen_vimdoc.py
index cb80bd05c6..2d2d46d1bd 100755
--- a/scripts/gen_vimdoc.py
+++ b/scripts/gen_vimdoc.py
@@ -166,6 +166,7 @@ CONFIG = {
             'util.lua',
             'log.lua',
             'rpc.lua',
+            'sync.lua',
             'protocol.lua',
         ],
         'files': ' '.join([