diff --git a/doc/source/user_manual/enhancing.rst b/doc/source/user_manual/enhancing.rst
index 7265e27..42169c4 100644
--- a/doc/source/user_manual/enhancing.rst
+++ b/doc/source/user_manual/enhancing.rst
@@ -14,5 +14,10 @@ The following C++ and Python examples can help get you started:
 Building your own cscripts
 --------------------------
 
+To be written ...
+
+
 Building your own ctools
 ------------------------
+
+To be written ...
diff --git a/doc/source/user_manual/expert.rst b/doc/source/user_manual/expert.rst
index 2fec16f..61b6ee9 100644
--- a/doc/source/user_manual/expert.rst
+++ b/doc/source/user_manual/expert.rst
@@ -4,8 +4,16 @@ Behind the scenes
 CTA data structure
 ------------------
 
+To be written ...
+
+
 Instrument response functions
 -----------------------------
 
+To be written ...
+
+
 Maximum likelihood fitting
---------------------------
\ No newline at end of file
+--------------------------
+
+To be written ...