diff --git a/source/how-tos/app-development/interactive/sub-apps.rst b/source/how-tos/app-development/interactive/sub-apps.rst
index ada0b036..6805f6a5 100644
--- a/source/how-tos/app-development/interactive/sub-apps.rst
+++ b/source/how-tos/app-development/interactive/sub-apps.rst
@@ -1,6 +1,6 @@
 
 Sub-Apps and Reconfiguring existing apps
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+========================================
 
 Sub-Apps are a term we use for providing variants of existing apps.
 They act as a child to the existing parent application.  That is,