diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -219,7 +219,9 @@ Executing `repo-merge` again should not change anything.
 
 ### 5. Implement `crb/repo-deliver` (see [API](#crbrepo-deliver-src))
 
-Relevant commands are provided under the 'Reference' and 'Commit History' slides.
+Relevant commands are provided under the 'Reference' and 'Commit History' slides. 
+
+Note that you cannot update all references at once (in contrast to when you use `git fetch` or `git push`), you have to manually update every reference for each author. 
 
 #### Test