diff --git a/Filer-Commands-and-Operations.md b/Filer-Commands-and-Operations.md
index fe4c893..bfa41a9 100644
--- a/Filer-Commands-and-Operations.md
+++ b/Filer-Commands-and-Operations.md
@@ -25,7 +25,7 @@ This put very little loads on filer and the master server. Data is only transmit
 
 ## Register a file on Filer
 
-As mentioned above, the (path, fileId, fileSize) can be registered on filer with this gRpc call.
+As mentioned above, the (path, fileId, fileSize) can be registered on filer with this gRPC call.
 
     filer_pb.SeaweedFilerClient.CreateEntry()