diff --git a/COMPOSITE_HOWTO b/COMPOSITE_HOWTO
index ec03220d74..f46b2a2fff 100644
--- a/COMPOSITE_HOWTO
+++ b/COMPOSITE_HOWTO
@@ -42,6 +42,10 @@ Refresh rate is slower than it should be
     - nvidia drivers use refresh rate to work around some X limitations
     - disable DynamicTwinView (see nvidia README)
     - should(?) be fixed with drivers updated for xrandr1.2
+AddARGBGLXVisuals options seems to work only with depth 24
+    - change your xorg.conf to use depth 24 (or you a configuration tool)
+
+check your X log (/var/log/X*.log) for warnings and errors if there are other problems
 
 
 Intel:
@@ -88,9 +92,11 @@ Issues:
 With the i810 driver, DRI works only on the first running X (if you use secondary X session,
     compositing won't work there), the intel driver doesn't seem to have this problem.
 You may get only white rectangles if DRI is not enabled or fails to initialize
-    - check your X log (/var/log/X*) and your xorg.conf
+    - check your X log (/var/log/X*.log) and your xorg.conf
 Window contents updating may not work properly in secondary X session (likely X/driver bug)
 
+check your X log (/var/log/X*.log) for warnings and errors if there are other problems
+
 
 ATI:
 ========