diff --git a/kong/clustering/services/sync/rpc.lua b/kong/clustering/services/sync/rpc.lua
index f3b6cb9229ad..1a8f749af01d 100644
--- a/kong/clustering/services/sync/rpc.lua
+++ b/kong/clustering/services/sync/rpc.lua
@@ -334,7 +334,9 @@ local function sync_handler(premature)
   end
 
   local res, err = concurrency.with_worker_mutex(SYNC_MUTEX_OPTS, function()
-    -- here must be 2 times
+    -- `do_sync()` is run twice in a row to report back new version number
+    -- to CP quickly after sync. (`kong.sync.v2.get_delta` is used for both pulling delta
+    -- as well as status reporting)
     for _ = 1, 2 do
       local ok, err = do_sync()
       if not ok then