diff --git a/doc/src/05100-lib-habit.md b/doc/src/05100-lib-habit.md
index 2d716889..da2259ec 100644
--- a/doc/src/05100-lib-habit.md
+++ b/doc/src/05100-lib-habit.md
@@ -1,2 +1,9 @@
 ## libimaghabit
 
+The habit library implements a habit tracker.
+
+A habit can be instantiated with a name and a time-period in which it should be fullfilled (eg. daily, ever 3 days, weekly...). 
+
+The module offers ways to generate statistics about habits.
+
+
diff --git a/doc/src/05100-lib-news.md b/doc/src/05100-lib-news.md
index 8155dbfe..37a99bf9 100644
--- a/doc/src/05100-lib-news.md
+++ b/doc/src/05100-lib-news.md
@@ -1,2 +1,7 @@
 ## libimagnews
 
+The library for the news module implements a RSS reader.
+
+Details, for example where the feeds are stored (inside or outside the imag store) have to be evaluated.
+
+
diff --git a/doc/src/05100-lib-todo.md b/doc/src/05100-lib-todo.md
index 186fb018..d37085bd 100644
--- a/doc/src/05100-lib-todo.md
+++ b/doc/src/05100-lib-todo.md
@@ -1,2 +1,7 @@
 ## libimagtodo
 
+The library for the todo module.
+
+Whether this wraps `taskwarrior` or implements a todo tracking mechanism in imag itself is to be defined. Probably the latter.
+
+
diff --git a/doc/src/05100-lib-wiki.md b/doc/src/05100-lib-wiki.md
index 0a86446b..23f0a6ee 100644
--- a/doc/src/05100-lib-wiki.md
+++ b/doc/src/05100-lib-wiki.md
@@ -1,2 +1,7 @@
 ## libimagwiki
 
+The wiki library implements a complete wiki for personal use.
+
+This basically is a note-taking functionality combined with linking.
+
+