diff --git a/hack/reference-docs/config.yaml b/hack/reference-docs/config.yaml
index fe352ad18..e2016f8d7 100644
--- a/hack/reference-docs/config.yaml
+++ b/hack/reference-docs/config.yaml
@@ -14,3 +14,9 @@ resource_categories:
   - name: "Issuer"
     version: "v1alpha1"
     group: "certmanager"
+  - name: "Order"
+    version: "v1alpha1"
+    group: "certmanager"
+  - name: "Challenge"
+    version: "v1alpha1"
+    group: "certmanager"