diff -r 1b312123c34c surf.1
--- a/surf.1	Tue Feb 21 12:00:01 2012 +0100
+++ b/surf.1	Tue Mar 13 11:28:00 2012 -0700
@@ -89,6 +89,13 @@
 .TP
 .B Ctrl\-o
 show the sourcecode of the current page.
+.SH ENVIRONMENT
+.TP
+.B SURF_USERAGENT
+If this variable is set upon startup, surf will use it as the useragent string
+.TP
+.B http_proxy
+If this variable is set and not empty upon startup, surf will use it as the http proxy
 .SH SEE ALSO
 .BR dmenu(1),
 .BR xprop(1),