diff --git a/dev-tools/idea/lucene/lucene.iml b/dev-tools/idea/lucene/lucene.iml
index e16ece78925..23f77a599f1 100644
--- a/dev-tools/idea/lucene/lucene.iml
+++ b/dev-tools/idea/lucene/lucene.iml
@@ -6,6 +6,7 @@
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/tools/java" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src/test-framework" isTestSource="true" />
       <sourceFolder url="file://$MODULE_DIR$/src/test" isTestSource="true" />
       <excludeFolder url="file://$MODULE_DIR$/build" />