diff --git a/README.md b/README.md
index a07a13d..c898bf7 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ If you need to add other parameters, version number must be assigned!
 <pre><code>bash InstallNET.sh -debian/kali/ubuntu/centos/almalinux/rockylinux/fedora(os type) 11(os version) -version 64(os bit, not necessary) -port "your server port" -pwd "your server password" -mirror "a valid url for linux image source" -dd/--image "dd image url" -filetype "gz or xz" -timezone "like Asia/Tokyo etc" --dhcp-static/--ip-addr 'x.x.x.x'(ip address) --ip-mask 'x.x.x.x'(subnet mask) --ip-gate 'x.x.x.x'(gateway) -firmware(Debian with hardware drivers)</code></pre>
 
 ## Parameters detail descriptions
-**-debian 9/10/11/12** : Debian 9 and later
+**-debian 9-12** : Debian 9 and later
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@@ -64,7 +64,7 @@ If you need to add other parameters, version number must be assigned!
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-**-centos 7/8/9-stream**: CentOS 7 and later
+**-centos 7 or 8/9-stream**: CentOS 7 and later
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