nes: Document whether waitvblank waits for the start or end of vblank

diff --git a/doc/nes.sgml b/doc/nes.sgml
index ca9ce72b351eb93e288d372c34619887e2859291..ae8e4a9719fd12c3d0765b53021302110cb22aa1 100644 (file)
--- a/doc/nes.sgml
+++ b/doc/nes.sgml
@@ -69,7 +69,7 @@ Programs containing NES specific code may use the <tt/nes.h/ header file.
 <sect1>NES specific functions<p>
 
 <itemize>
-<item>waitvblank
+<item>waitvblank - wait until the start of vblank
 <item>get_tv
 </itemize>