diff --git a/data/threadbuilder/userjoinexample.yml b/data/threadbuilder/userjoinexample.yml
index 6df42e8f..d41665ca 100644
--- a/data/threadbuilder/userjoinexample.yml
+++ b/data/threadbuilder/userjoinexample.yml
@@ -91,11 +91,11 @@ graph:
     baseSnapshot: A.1.1
     aclHeads: [B.1.1]
     treeHeads: [B.1.1]
-  - id: A.1.3
+  - id: A.1.3 # this should be invalid, because it is based on one of the invalid changes
     baseSnapshot: A.1.1
     aclHeads: [B.1.1]
     treeHeads: [B.1.2, C.1.1]
-  - id: C.1.1
+  - id: C.1.1 # this should be invalid, because C is a reader
     baseSnapshot: A.1.1
     aclHeads: [B.1.1]
     treeHeads: [B.1.1]