--- cvsroot/rxvt-unicode/README.configure	2010/10/15 21:30:51	1.67
+++ cvsroot/rxvt-unicode/README.configure	2010/11/13 00:48:11	1.68
@@ -124,8 +124,10 @@
         BMP, ICO and TGA.
 
     --enable-transparency (default: on)
-        Add support for backgrounds, creating illusion of transparency in
-        the term.
+        Add support for using the root pixmap as background to simulate
+        transparency. Note that tint, blur and blend effects depend on
+        libAfterImage or on libXrender and on the availability of the RENDER
+        extension in the X server.
 
     --enable-fading (default: on)
         Add support for fading the text when focus is lost.