diff --git a/README.md b/README.md
index aa30323..c4eeff7 100644
--- a/README.md
+++ b/README.md
@@ -101,7 +101,7 @@ SysCap tools usually integrate to IDE, APP store and bundle tools. Follow instru
 
 -i filepath, --input filepath : input file
 
--o outpath, --input outpath : output path
+-o outpath, --output outpath : output path
 ```
 
 ## Syscap consistency check tool
diff --git a/README_ZH.md b/README_ZH.md
index 40dda44..60f5406 100644
--- a/README_ZH.md
+++ b/README_ZH.md
@@ -96,7 +96,7 @@ syscap_tool -R/P -e/d -i filepath [-o outpath]
 -d, --decode    : decode to json format.
         -s, --string : decode string format.
 -i filepath, --input filepath   : input file
--o outpath, --input outpath     : output path
+-o outpath, --output outpath     : output path
 -v, --version   : print syscap_tool version information.
 
 syscap_tool v1.1.1
diff --git a/src/main.c b/src/main.c
index 4593ddf..e71e270 100644
--- a/src/main.c
+++ b/src/main.c
@@ -205,7 +205,7 @@ void PrintHelp(void)
     printf("-e, --encode\t: encode to sc format.\n\t-s, --string : encode to string format.\n");
     printf("-d, --decode\t: decode to json format.\n\t-s, --string : decode string format.\n");
     printf("-i filepath, --input filepath\t: input file\n");
-    printf("-o outpath, --input outpath\t: output path\n");
+    printf("-o outpath, --output outpath\t: output path\n");
     printf("-v, --version\t: print syscap_tool version information.\n");
 }