diff --git a/src/Neo/Ledger/MemoryPool.cs b/src/Neo/Ledger/MemoryPool.cs
index 7ccdde18b3..ff9c6b1069 100644
--- a/src/Neo/Ledger/MemoryPool.cs
+++ b/src/Neo/Ledger/MemoryPool.cs
@@ -661,7 +661,7 @@ internal bool ReVerifyTopUnverifiedTransactionsIfNeeded(int maxToVerify, DataCac
         }
 
         // This method is only for test purpose
-        // Do not use this method outside unit tests
+        // Do not use this method outside of unit tests
         internal void Clear()
         {
             _txRwLock.EnterReadLock();