diff --git a/calls.doap b/calls.doap
index 5fb3ff2..2b37cf9 100644
--- a/calls.doap
+++ b/calls.doap
@@ -19,6 +19,7 @@
     <foaf:Person>
       <foaf:name>Julian Sparber</foaf:name>
       <foaf:mbox rdf:resource="mailto:julian.sparber@puri.sm" />
+      <gnome:userid>jsparber</gnome:userid>
     </foaf:Person>
   </maintainer>
   <maintainer>
@@ -26,6 +27,7 @@
       <foaf:name>Evangelos Ribeiro Tzaras</foaf:name>
       <foaf:mbox rdf:resource="mailto:evangelos.tzaras@puri.sm" />
       <foaf:mbox rdf:resource="mailto:devrtz@fortysixandtwo.eu" />
+      <gnome:userid>devrtz</gnome:userid>
     </foaf:Person>
   </maintainer>
 </Project>