diff --git a/backend/MediaCacheManager.py b/backend/MediaCacheManager.py
index 563c685..f0d1919 100644
--- a/backend/MediaCacheManager.py
+++ b/backend/MediaCacheManager.py
@@ -238,6 +238,7 @@ class MediaChunkHolderManager(object):
             if cache_holder is None:
                 logger.warning(f"the holder not in mem, {holder}")
                 return
+            logger.info(f"cache new chunk:{holder}")
             self.disk_chunk_cache.set(holder.chunk_id, holder)
 
         return MediaChunkHolder(chat_id, msg_id, start, target_len, callback=holder_completed_callback)