diff --git a/rm-server/source/java/org/alfresco/module/org_alfresco_module_rm/classification/UserQueryParams.java b/rm-server/source/java/org/alfresco/module/org_alfresco_module_rm/classification/UserQueryParams.java
index dc874ad7ec..46a20531f5 100644
--- a/rm-server/source/java/org/alfresco/module/org_alfresco_module_rm/classification/UserQueryParams.java
+++ b/rm-server/source/java/org/alfresco/module/org_alfresco_module_rm/classification/UserQueryParams.java
@@ -50,7 +50,7 @@ public final class UserQueryParams
 
     public UserQueryParams(final String searchTerm)
     {
-        ParameterCheck.mandatoryString("searchTerm", searchTerm);
+        // A 'null' value here is allowed.
         this.searchTerm = searchTerm;
     }