diff --git a/Doc/source/designspaceLib/readme.rst b/Doc/source/designspaceLib/readme.rst
index d563e8501..df178fb16 100644
--- a/Doc/source/designspaceLib/readme.rst
+++ b/Doc/source/designspaceLib/readme.rst
@@ -312,8 +312,8 @@ Evaluating rules
 
     r1 = RuleDescriptor()
     r1.name = "unique.rule.name"
-    r1.conditionsSets.append([dict(name="weight", minimum=-10, maximum=10), dict(...)])
-    r1.conditionsSets.append([dict(...), dict(...)])
+    r1.conditionSets.append([dict(name="weight", minimum=-10, maximum=10), dict(...)])
+    r1.conditionSets.append([dict(...), dict(...)])
     r1.subs.append(("a", "a.alt"))