diff --git a/src/tsdb/src/tsdbRecover.c b/src/tsdb/src/tsdbRecover.c
index de3a912cc3bd973f91173d4bd41203ada73879b8..da2dd208bbea241ef2a69b38465c32d5eb0d252f 100644
--- a/src/tsdb/src/tsdbRecover.c
+++ b/src/tsdb/src/tsdbRecover.c
@@ -358,6 +358,7 @@ int tsdbRefactorFS(STsdbRepo *pRepo) {
 
   tsdbDestoryRecoverH(&recoverH);
   if (nRemain == size) {
+    // all head files are not changed
     tsdbEndFSTxnWithError(REPO_FS(pRepo));
   } else {
     if (pStatus != NULL) {