diff --git a/cmd/mirror-main.go b/cmd/mirror-main.go
index ab443bc8f2..da8fd210cd 100644
--- a/cmd/mirror-main.go
+++ b/cmd/mirror-main.go
@@ -48,7 +48,7 @@ var (
 		},
 		cli.BoolFlag{
 			Name:  "overwrite",
-			Usage: "overwrite object(s) on target",
+			Usage: "overwrite object(s) on target if it differs from source",
 		},
 		cli.BoolFlag{
 			Name:  "fake",
diff --git a/docs/minio-client-complete-guide.md b/docs/minio-client-complete-guide.md
index 6bf9581abe..3e9d99bc60 100644
--- a/docs/minio-client-complete-guide.md
+++ b/docs/minio-client-complete-guide.md
@@ -1050,7 +1050,7 @@ USAGE:
    mc mirror [FLAGS] SOURCE TARGET
 
 FLAGS:
-  --overwrite                        overwrite object(s) on target
+  --overwrite                        overwrite object(s) on target if it differs from source
   --fake                             perform a fake mirror operation
   --watch, -w                        watch and synchronize changes
   --remove                           remove extraneous object(s) on target