+Configuration file
+------------------
+
+m_librarian looks up configuration file in $HOME/.config/ (if your OS is
+POSIX-compatible). The configuration file must be named
+``m_librarian.conf``. It must be in ``ini``-file format. The following
+sections and keys are now understood::
+
+ [database]
+ URI = "database URI"
+
+ [library]
+ path = "path to the library archives"
+
+ [download]
+ format = "download file format"
+
+Most programs have an option `-C|--config file` to use a non-default
+configuration file.