Clarify proxy configuration

diff --git a/doc/vimb.1 b/doc/vimb.1
index 2040f5d..c9df3d4 100644 (file)
--- a/doc/vimb.1
+++ b/doc/vimb.1
@@ -1369,10 +1369,10 @@ There are also some sample scripts installed together with Vimb under
 PREFIX/share/vimb/examples.
 .SH ENVIRONMENT
 .TP
-.B http_proxy
-If this variable is set to an non-empty value, and the configuration option
-`proxy' is enabled, this will be used as HTTP proxy.
-If the proxy URL has no scheme set, HTTP is assumed.
+.B http_proxy, HTTP_PROXY
+If either environment variable is non-empty, the specified host and
+optional port is used to tunnel requests. For example:
+HTTP_PROXY=localhost:8118.
 .SH "REPORTING BUGS"
 Report bugs to the main project page on https://github.com/fanglingsu/vimb/issues
 .br