diff --git a/core.py b/core.py
index b3e1aee..90b068a 100644
--- a/core.py
+++ b/core.py
@@ -140,6 +140,8 @@ class GMCLCore(object):
         '''The recommendation memory value set function'''
         self.__Memory = float(psutil.virtual_memory().free / 1024 ** 3) * 0.8
     def SetJavaPath(self,path):
+        '''The java path set function'''
+        ''':Path Your java path'''
         if(path==None):
             return "Error:Wrong local address for java."
         else:
@@ -148,12 +150,17 @@ class GMCLCore(object):
             else:
                 return "Error:Wrong local address for java."
     def SetGameMem(self,Memory):
+        '''The game memory value set function'''
+        ''':Memory The memory of the game,the unit is GiBytes'''
         try:
             self.__Memory=float(Memory)
         except:
             return "Error:Wrong parameter for game memory."
     def Download(self,DownloadFrom,DownloadTo,ThreadNum=3):
-        '''Multi-Thread download function'''
+        '''The multi-thread download function'''
+        ''':DownloadFrom The online url for the file'''
+        ''':DownloadTo The local path for the file'''
+        ''':ThreadNum The number of the thread,the default value is 3'''
         if(DownloadFrom=="" or DownloadTo==""):
             return "Error:Wrong online address or local address for download."
         else: