diff --git a/include/phxpaxos/sm.h b/include/phxpaxos/sm.h
index 601c96c66..f5d8687c1 100644
--- a/include/phxpaxos/sm.h
+++ b/include/phxpaxos/sm.h
@@ -107,7 +107,7 @@ class StateMachine
     virtual void BeforePropose(const int iGroupIdx, std::string & sValue);
 
     //Because function BeforePropose much waste cpu,
-    //Only NeedCallBeforePropose return true then weill call function BeforePropose.
+    //Only NeedCallBeforePropose return true then will call function BeforePropose.
     //You can use this function to control call frequency.
     //Default is false.
     virtual const bool NeedCallBeforePropose();