diff --git a/lucene/common-build.xml b/lucene/common-build.xml
index 3b69e31bdc8..b1d4899170e 100644
--- a/lucene/common-build.xml
+++ b/lucene/common-build.xml
@@ -829,6 +829,7 @@
             <classpath refid="@{junit.classpath}"/>
             <classpath refid="clover.classpath" />
 
+            <!-- Assertions. -->
             <assertions>
               <enable package="org.apache.lucene"/>
               <enable package="org.apache.solr"/>