diff --git a/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java b/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java
index 0810449..eb302af 100644
--- a/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java
+++ b/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java
@@ -177,7 +177,7 @@ public class PropertyChecker
         this.serviceRules.add("host.country.name", STRING, PropertyMode.WISHED);
         this.serviceRules.add("host.country.code", STRING, PropertyMode.WISHED);
 
-        // this.serviceRules.add(SUBS, URL, PropertyMode.MANDATORY);
+        this.serviceRules.add(SUBS, URL, PropertyMode.OPTIONAL);
         this.serviceRules.add(METRICS_NAME, STRING, PropertyMode.OPTIONAL);
         this.serviceRules.add(METRICS_DESCRIPTION, STRING, PropertyMode.OPTIONAL);
         this.serviceRules.add(METRICS_YEAR, NUMERIC, PropertyMode.OPTIONAL);