diff --git a/README.md b/README.md
index c5f2069..689bc2b 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,7 @@ opendkim-key=              # Provided by mail.sh
 ```
 
 ## :: Installation
-Open the following ports:
+Open the following TCP ports:
 
 ```
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