QPIDIT-125: try adding a sub-heading for visibility and separation
diff --git a/QUICKSTART.md b/QUICKSTART.md
index 957c4ac..9bcfcc3 100644
--- a/QUICKSTART.md
+++ b/QUICKSTART.md
@@ -242,6 +242,8 @@
 
 ````
 
+### 4.1 Source repository
+
 If you are a developer working on changes to qpid-interop-test itself, the
 source repository can be cloned from git as follows: