diff --git a/README.md b/README.md
index 1c6c793..0f3ef6e 100644
--- a/README.md
+++ b/README.md
@@ -35,4 +35,11 @@ Setting up the board inworld requires you to edit one line in the scripts. Rez t
 Thats all i think.
 
 
-*The entire project is release under the BSD license. Even if not all files including a reference to that license, they are still BSD licensed.*
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+*The entire project is release under the BSD license. Even if not all files including a reference to that license, they are still BSD licensed.*
+
+-----
+**Banned users**
+
+This visitorboard allows to blacklist users or grids. Blacklisted users or grids will not be shown with their original data on the visitorboard and are being replaced by dummy data.
+
+To blacklist an user or a grid or whatever, you have to create a new entry in the MySql table bans. The column **banvalue** includes the data. You can enter a name, a partial name, a uuid, a grid uri or part of it or whatever into this field. For example the entry `osgrid.org` will backlist all users coming from the osgrid.
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