diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 5a72f5d63..32cf0baf4 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -3,6 +3,7 @@ D1X-Rebirth Changelog
 20110912
 --------
 arch/sdl/mouse.c, ui/mouse.c: Move EVENT_MOUSE_DOUBLE_CLICKED support from ui/mouse.c to arch/sdl/mouse.c for tidiness and to possibly use it outside the editor
+INSTALL.txt: Put back the instructions for installing the PC data
 
 20110826
 --------
diff --git a/INSTALL.txt b/INSTALL.txt
index e078d827a..d026cd41e 100644
--- a/INSTALL.txt
+++ b/INSTALL.txt
@@ -75,6 +75,20 @@ Needed files:
    Of course you can also use the Shareware game content with D1X-Rebirth which you can find here:
    http://www.dxx-rebirth.com/game-content/
 
+   For the PC CD-ROM, these files should be located on the Descent1 CD-Rom. The PC version data files need
+   to be patched to version 1.4a.
+
+   There is a patch suitable for Mac OS X available at:
+   http://www.dxx-rebirth.com/download/dxx/misc/descent-game-content-10to14a-patch.zip
+
+   To play the Multiplayer levelset 'Total Chaos', make sure the files
+
+   chaos.hog
+   chaos.msn
+
+   are in the subdirectory 'Missions'. These files should also be located on the Descent1 CD. For the
+   Mac CD data, simply move these files, after installing, from 'Data' to 'Missions'.
+
 
 Where to put these files:
 =========================