diff --git a/readme.md b/readme.md
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--- a/readme.md
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@@ -9,6 +9,12 @@
   * [X] ForgeJo / Gitea / GitHub
   * [X] GitLab
 
+## How
+
+### Variables
+
+| CD_DNS | Space separated servers |
+
 ## Tasks
 
 * use constants for OS names