diff --git a/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/dto/ListPersonsCriteria.java b/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/dto/ListPersonsCriteria.java
index 3ccef9c40775c4ac01621710a8d113a8b2b9b14e..903f0133a9b475956cebe8e4bd421623f35c59d5 100644
--- a/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/dto/ListPersonsCriteria.java
+++ b/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/dto/ListPersonsCriteria.java
@@ -29,6 +29,8 @@ import ch.systemsx.cisd.openbis.generic.shared.basic.dto.Person;
 public final class ListPersonsCriteria extends DefaultResultSetConfig<String, Person> implements
         IsSerializable
 {
+    // If not null, persons form the authorization group will be listed.
+    // Otherwise all persons are listed.
     private TechId authorizationGroupId;
 
     public ListPersonsCriteria()