Index: docs/UsersManual.rst
===================================================================
--- docs/UsersManual.rst	(Revision 201876)
+++ docs/UsersManual.rst	(Arbeitskopie)
@@ -1093,7 +1093,7 @@
   Generate complete debug info.
 
 Comment Parsing Options
---------------------------
+-----------------------
 
 Clang parses Doxygen and non-Doxygen style documentation comments and attaches
 them to the appropriate declaration nodes.  By default, it only parses
@@ -1100,11 +1100,25 @@
 Doxygen-style comments and ignores ordinary comments starting with ``//`` and
 ``/*``.
 
+.. option:: -Wno-documentation-unknown-command
+
+  Warn when encountering an unknown Doxygen command.
+
 .. option:: -fparse-all-comments
 
   Parse all comments as documentation comments (including ordinary comments
   starting with ``//`` and ``/*``).
 
+.. option:: -fcomment-block-commands=[commands]
+
+  Define custom Doxygen commands to avoid incorrect warnings when using
+  ``-Wno-documentation-unknown-command``. Several commands must be separated by a comma
+  *without trailing space*; e.g. ``-fcomment-block-commands=foo,bar`` defines the custom
+  commands ``\foo`` and ``\bar``.
+  
+  It is also possible to use ``-fcomment-block-commands`` several times; e.g.
+  ``-fcomment-block-commands=foo -fcomment-block-commands=bar`` does the same as above.
+
 .. _c:
 
 C Language Features