diff --git a/config/clusters/awi-ciroh/staging.values.yaml b/config/clusters/awi-ciroh/staging.values.yaml
index 249deea1d..5ccda2f90 100644
--- a/config/clusters/awi-ciroh/staging.values.yaml
+++ b/config/clusters/awi-ciroh/staging.values.yaml
@@ -49,6 +49,13 @@ basehub:
                   slug: "new"
                   kubespawner_override:
                     image: "quay.io/2i2c/awi-ciroh-image:79bb68961852"
+              unlisted_choice:
+                enabled: True
+                display_name: "Custom image"
+                validation_regex: "^.+:.+$"
+                validation_message: "Must be a publicly available docker image, of form <image-name>:<tag>"
+                kubespawner_override:
+                  image: "{value}"
           kubespawner_override:
             mem_limit: 7G
             mem_guarantee: 5G