diff --git a/source/how-tos/app-development/interactive/sub-apps.rst b/source/how-tos/app-development/interactive/sub-apps.rst
index b5fa9241..ada0b036 100644
--- a/source/how-tos/app-development/interactive/sub-apps.rst
+++ b/source/how-tos/app-development/interactive/sub-apps.rst
@@ -1,5 +1,5 @@
 
-Sub-Apps and Reconfiguring exsting apps
+Sub-Apps and Reconfiguring existing apps
 =======================================
 
 Sub-Apps are a term we use for providing variants of existing apps.
@@ -87,4 +87,4 @@ chosen for them.
 
 Now users will be presented with both variants. ``My App`` and
 ``My App: preset``.  The system used the name ``preset`` based
-on the name of the file.
\ No newline at end of file
+on the name of the file.