diff --git a/xml/obs_scm_bridge.xml b/xml/obs_scm_bridge.xml
index eddabc9f..e2f660d3 100644
--- a/xml/obs_scm_bridge.xml
+++ b/xml/obs_scm_bridge.xml
@@ -77,6 +77,12 @@
             clone the entire project to modify a single package.</para>
 
       <para>The build configuration part can get stored as '_config' file in the top level directory.</para>
+
+      <para>It is possible to limit the actual used package sources by specifying an "onlybuild" cgi parameter
+      as part of the scmsync url. This parameter can be used multiple times. This is useful,
+      for example, when trying to do a test build of just a few packages without the need to modify the source.
+      In that way an open merge request may be tested before merging. Example URL:</para>
+         <screen>&lt;scmsync&gt;https://gitlab.com/some/repository?onlybuild=glibc&amp;onlybuild=kernel&lt;/scmsync&gt;</screen>
     </sect2>
 
     <sect2 xml:id="sec.obs.obs_scm_bridge.implementation_and_limitations">