diff --git a/man/epubgrep.1.adoc b/man/epubgrep.1.adoc
index 0672952..e85a451 100644
--- a/man/epubgrep.1.adoc
+++ b/man/epubgrep.1.adoc
@@ -18,7 +18,8 @@ epubgrep - Search tool for EPUB ebooks.
 == DESCRIPTION
 
 *epubgrep* searches EPUB files in a similar way as grep. It uses the same names
-for command line switches.
+for command line switches where possible. However, not all grep switches are
+implemented and some additional switches are added.
 
 == OPTIONS
 
@@ -28,27 +29,53 @@ Display a short help message and exit.
 *V*, *--version*::
 Show version, copyright and license.
 
+*-G*, *--basic-regexp*::
+_PATTERN_ is a POSIX basic regular expression. This is the default.
+
 *-E*, *--extended-regexp*::
-_PATTERN_ is extended regular expression.
+_PATTERN_ is a POSIX extended regular expression.
+
+*--grep*::
+In combination with *--basic-regexp* or *--extended-regexp*, _PATTERN_ is
+treated as a newline separated list of expressions, a match is found if any of
+the expressions in the list match.
 
 *-P*, *--perl-regexp*::
-_PATTERN_ is Perl regular expression.
+_PATTERN_ is a Perl regular expression.
 
 *-i*, *--ignore-case*::
 Ignore case distinctions in pattern and data.
 
 *-e* _PATTERN_, *--regexp* _PATTERN_::
-Use _PATTERN_ for matching.
+Use additional _PATTERN_ for matching. Can be used more than once.
 
-*-I* _FILE_, *--input-file* _FILE_::
-Input file. Can be used more than once.
+== USAGE
 
-// == USAGE
+=== Configuration
 
-// === Configuration
+Every command line switch can be used as an option in the configuration file. If
+the switch has no value (it is a simple on switch), it has to be written as
+`option = 1`. Do not use quotation marks around the values, they will be taken
+literally.
+
+Command line options overwrite configuration file options. Options that can
+occur more than once are merged.
+
+==== Example configuration file
+
+This example makes epubgrep always use Perl regular expressions and search for
+mentions of the words thyme and oregano in every book.
+
+[source,cfg]
+--------------------------------------------------------------------------------
+perl-regexp = 1
+regexp = \b[Tt]hyme\b
+regexp = \b[Oo]regano\b
+--------------------------------------------------------------------------------
 
 // == EXAMPLES
 
+
 == FILES
 
 *Configuration file*::