diff --git a/README b/README
index fa87603..8e7db33 100644
--- a/README
+++ b/README
@@ -4,7 +4,8 @@ fixed, this version should run much more stable than the the old
 SDK version. It must be used with the "Yamagi Quake II Client".
 For more information visit http://www.yamagi.org/quake2.
 
-Installation for FreeBSD and Linux:
+Installation for FreeBSD, Linux and OpenBSD:
+--------------------------------------------
 1. Type "make" or "gmake" to compile the game.so.
 2. Create a subdirectory xatrix/ in your quake2 directory.
 3. Copy pak0.pak and videos/ from the the Reckoning CD to
@@ -12,11 +13,25 @@ Installation for FreeBSD and Linux:
 4. Copy release/game.so to xatrix/.
 5. Start the game with "./quake2 +set game xatrix"
 
-Installation for Windows:
+Installation for OS X:
+----------------------
 1. Create a subdirectory xatrix/ in your quake2 directory.
 2. Copy pak0.pak and videos/ from the the Reckoning CD to
    the newly created directory xatrix/.
 3. Copy game.dll from the zip-archive to xatrix/.
+4. Start the game with "quake2 +set game xatrix"
+
+If you want to compile 'xatrix' for OS X from source, please take a
+look at the "Installation" section of the README of the Yamagi Quake II
+client. In the same file the integration into an app-bundle is
+explained.
+
+Installation for Windows:
+-------------------------
+1. Create a subdirectory xatrix\ in your quake2 directory.
+2. Copy pak0.pak and videos\ from the the Reckoning CD to
+   the newly created directory xatrix\.
+3. Copy game.dll from the zip-archive to xatrix/.
 4. Start the game with "quake2.exe +set game xatrix"
 
 If you want to compile 'xatrix' for Windows from source, please take a