diff --git a/README.md b/README.md
index 7f374e4..7b4281f 100644
--- a/README.md
+++ b/README.md
@@ -38,4 +38,16 @@ after mongo conaintainer came up the first time run:
 ```
 abra app run wekan.example.org db mongo
 > rs.initiate() 
-```
\ No newline at end of file
+```
+
+## Promote user to admin
+
+If using SSO, it might happen that there is no admin user. If so, you can fix it manually in the database:
+
+```
+$ abra app run <app-name> db bash
+# mongo
+> use wekan
+> db.users.find({'username': '<your username>'})
+> db.users.updateOne({'_id': '<_id from result above>'}, {$set: {'isAdmin': true}})
+```