diff --git a/README.md b/README.md
index c5a9c13..1dfe1f7 100644
--- a/README.md
+++ b/README.md
@@ -263,7 +263,7 @@ For Fedora, official recommend mirror lists are here:
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-**-allbymyself**: Install OS supported by this script manually, must have VNC, this option is not valid for Redhat series.
+**--allbymyself**: Install OS supported by this script manually, must have VNC, this option is not valid for Redhat series.
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