diff --git a/pkg/types/pipeline.schema.v1.json b/pkg/types/pipeline.schema.v1.json
index 9d07cdf..99702e2 100644
--- a/pkg/types/pipeline.schema.v1.json
+++ b/pkg/types/pipeline.schema.v1.json
@@ -34,7 +34,15 @@
               "maximum": 10
             },
             "durationBetweenRetries": {
-              "type": "string"
+              "type": "string",
+              "enum": [
+                "1m",
+                "2m",
+                "5m",
+                "10m",
+                "15m",
+                "30m"
+              ]
             }
           }
         }