Document that help echo for menu items doesn't work on Windows.

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 596485857decebe9806366088026f9bcc1fd75ab..bef87e54a186ff4afa306cd91396126b93cef4d2 100644 (file)
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -183,6 +183,10 @@ developers.
 Emacs 21.1 built for MS-Windows doesn't support images, the tool bar,
 and tooltips.  Support for these will be added in future versions.
 
+Help text that is displayed in a tooltip on other window systems, on
+Windows is printed in the echo area, since tooltips are not yet
+available.  Help text for menu items is not displayed at all.
+
 There are problems with display if the variable `redisplay-dont-pause'
 is set to nil (w32-win.el sets it to t by default, to avoid these
 problems).  The problems include: