updated target

Change-Id: Ie9641a7aa79a2c293a14b1f966471f6f58afafc1

tools/org.eclipse.sphinx.targets/2021-09/2021-09.target

diff --git a/tools/org.eclipse.sphinx.targets/2021-09/2021-09.target b/tools/org.eclipse.sphinx.targets/2021-09/2021-09.target
index 05ea1b0..ee61518 100644
--- a/tools/org.eclipse.sphinx.targets/2021-09/2021-09.target
+++ b/tools/org.eclipse.sphinx.targets/2021-09/2021-09.target
@@ -58,7 +58,7 @@
 <unit id="org.eclipse.graphiti.feature.examples.feature.group" version="0.18.0.202106091000"/>
 <repository location="http://download.eclipse.org/releases/2021-09/"/>
 </location>
-<location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" type="InstallableUnit">
+<location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="true" type="InstallableUnit">
 <unit id="org.eclipse.emf.examples" version="2.8.0.v20180706-1146"/>
 <unit id="org.eclipse.emf.examples.library" version="2.10.0.v20200518-1440"/>
 <repository location="https://download.eclipse.org/modeling/emf/emf/builds/release/2.27"/>