diff --git a/docs/gitbook/tutorials/contour-progressive-delivery.md b/docs/gitbook/tutorials/contour-progressive-delivery.md
index cfff41f9..29abec2d 100644
--- a/docs/gitbook/tutorials/contour-progressive-delivery.md
+++ b/docs/gitbook/tutorials/contour-progressive-delivery.md
@@ -90,6 +90,8 @@ spec:
     retries:
       attempts: 3
       perTryTimeout: 5s
+      # supported values for retryOn - https://projectcontour.io/docs/main/config/api/#projectcontour.io/v1.RetryOn
+      retryOn: "5xx"
   # define the canary analysis timing and KPIs
   analysis:
     # schedule interval (default 60s)