diff --git a/GUI/xephem/help/xephem.html b/GUI/xephem/help/xephem.html
index 216ad25..fc03b84 100644
--- a/GUI/xephem/help/xephem.html
+++ b/GUI/xephem/help/xephem.html
@@ -2195,8 +2195,8 @@ surface but would rather not change the XEphem date to a full Moon.<br>
 This value depends on the gamma of your display. A fine discussion
 of display gamma and a test image with which you can determine the
 gamma value of your own display may be found at the URL: <a
- href="http://www.cs.cmu.edu/afs/cs.cmu.edu/user/rwb/www/gamma.html"
- target="new">http://www.cs.cmu.edu/afs/cs.cmu.edu/user/rwb/www/gamma.html</a>.</div>
+ href="http://web.mit.edu/jmorzins/www/gamma/rwb/gamma.html"
+ target="new">http://web.mit.edu/jmorzins/www/gamma/rwb/gamma.html</a>.</div>
 <br>
 <span style="font-weight: bold;">Movie Demo</span><br>
 <br>