diff --git a/pkg/validation/policy/generate.go b/pkg/validation/policy/generate.go
index 7d0766e6e5..419ba4b36d 100644
--- a/pkg/validation/policy/generate.go
+++ b/pkg/validation/policy/generate.go
@@ -30,7 +30,7 @@ func immutableGenerateFields(new, old kyvernov1.PolicyInterface) (string, error)
 	}
 
 	if !newRuleHashes.IsSuperset(oldRuleHashes) {
-		return "", errors.New("changes of the rule spec in a generate rule is disallowed")
+		return "", errors.New("changes of immutable fields of a rule spec in a generate rule is disallowed")
 	}
 
 	return "", nil