From 43b8930b19738b7edb51bb58c0f7b8cb41c1cc78 Mon Sep 17 00:00:00 2001
From: "Mark D. Roth" <roth@google.com>
Date: Thu, 15 Jun 2017 11:41:28 -0700
Subject: [PATCH] Document use of ${http_proxy} environment variable.

---
 doc/environment_variables.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/doc/environment_variables.md b/doc/environment_variables.md
index 47efb3a1d8..dce434ff30 100644
--- a/doc/environment_variables.md
+++ b/doc/environment_variables.md
@@ -4,6 +4,10 @@ gRPC environment variables
 gRPC C core based implementations (those contained in this repository) expose
 some configuration as environment variables that can be set.
 
+* http_proxy
+  The URI of the proxy to use for HTTP CONNECT support.  Does not currently
+  support username or password information in the URI.
+
 * GRPC_ABORT_ON_LEAKS
   A debugging aid to cause a call to abort() when gRPC objects are leaked past
   grpc_shutdown(). Set to 1 to cause the abort, if unset or 0 it does not
-- 
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