[PATCH 1/2] Add warning to description of frame_bg_transparent

[Hans-Peter Deifel <hpdeifel _at_ gmx _dot_ de>]

---
 doc/herbstluftwm.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/doc/herbstluftwm.txt b/doc/herbstluftwm.txt
index 08649d2..72dc2ec 100644
--- a/doc/herbstluftwm.txt
+++ b/doc/herbstluftwm.txt
@@ -739,7 +739,9 @@ frame_bg_normal_color (String/Color)::
     always_show_frame is set)
 
 frame_bg_transparent (Integer)::
-    If set, frames have transparent backgrounds.
+    If set, frames have transparent backgrounds. *Warning:* Results in ugly
+    artifacts when used together with a compositing manager. Use
+    'frame_active_opacity' and 'frame_normal_opacity' in this case.
 
 frame_border_width (Integer)::
     Border width of a frame
-- 
1.8.1.2