diff --git a/tdlib.py b/tdlib.py
index dbe3455..5122916 100644
--- a/tdlib.py
+++ b/tdlib.py
@@ -149,10 +149,16 @@ class TdLibJSONEncoder(JSONEncoder):
 
 
 class TdLib:
-    def __init__(self) -> None:
+    def __init__(self, verbose: bool = False, maxCache: int = None) -> None:
         self._initalized = False
         self._destoried = False
         self._db_initalized = False
+        self._v = verbose
+        self._maxCache = 1000
+        if maxCache is not None:
+            if maxCache < 100:
+                raise ValueError('At least cache 100 messages.')
+            self._maxCache = maxCache
         self._e = 0
         self._re = {}
         self._rel = []
@@ -181,6 +187,10 @@ class TdLib:
         await self._thread.killed()
         _td_json_client_destroy(self._client_id)
         self._destoried = True
+        if self._v:
+            le1 = len(self._re)
+            le2 = len(self._rel)
+            print(f"There are {le1 + le2} ({le1} + {le2}) messages in cache.")
         del self._re
         del self._rel
 
@@ -201,9 +211,17 @@ class TdLib:
         if result:
             de = TdLibJSONDecoder()
             re = de.decode(result.decode())
+            if self._v:
+                if '@type' in re:
+                    print(f'Get message type: {re["@type"]}')
             if '@extra' in re:
                 self._re[re['@extra']] = re
             else:
+                while len(self._rel) >= self._maxCache:
+                    m = self._rel.pop(0)
+                    if self._v:
+                        t = m['@type'] if '@type' in m else 'Unknown'
+                        print(f'Discard a message in cache. Message type: {t}')
                 self._rel.append(re)
 
     async def addProxy(self, server, port, enable, type):
diff --git a/tg_delete_all_my_msgs.py b/tg_delete_all_my_msgs.py
index 650fe45..14b3a70 100644
--- a/tg_delete_all_my_msgs.py
+++ b/tg_delete_all_my_msgs.py
@@ -91,11 +91,13 @@ p.add_argument('chat_id', nargs='?', type=int, help="Specify the chat's ID.")
 p.add_argument('-n', '--chat-name', help="Specify chat's name. Will used if chat_id is not sepcified.", metavar='NAME', dest='chat_name')  # noqa: E501
 p.add_argument('-s', '--start-time', type=tparse, metavar='TIME', help="The messages which are sended before this time will not be deleted.", dest='start_time')  # noqa: E501
 p.add_argument('-e', '--end-time', type=tparse, metavar='TIME', help="The messages which are sended after this time will not be deleted.", dest="end_time")  # noqa: E501
+p.add_argument('-v', '--verbose', action='store_true', help="Enable verbose logging.", dest="verbose")  # noqa: E501
+p.add_argument('--max-cache', metavar='COUNT', type=int, help='Specify the max count of cache messages. At least 100.', dest="max_cache")  # noqa: E501
 arg = p.parse_intermixed_args()
 if arg.chat_id is None and arg.chat_name is None:
     raise ValueError('chat_id or chat_name is needed.')
 try:
-    with TdLib() as lib:
+    with TdLib(arg.verbose, arg.max_cache) as lib:
         re = asyncio.run(main(lib, arg))
     sys.exit(re)
 except Exception: