diff --git a/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerConfig.java b/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerConfig.java
index 58a9ce3d5a..daa5a0bf70 100644
--- a/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerConfig.java
+++ b/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerConfig.java
@@ -521,6 +521,11 @@ public class WorkerConfig extends AbstractConfig {
                 }
             }
         }
+
+        @Override
+        public String toString() {
+            return "List of comma-separated URIs, ex: http://localhost:8080,https://localhost:8443.";
+        }
     }
 
     private static class ResponseHttpHeadersValidator implements ConfigDef.Validator {