From 05dbac6b39ffd1b2df1af0f361e029884dc0bfb7 Mon Sep 17 00:00:00 2001
From: ncteisen <ncteisen@gmail.com>
Date: Thu, 13 Jul 2017 07:15:58 -0700
Subject: [PATCH] Update doc

---
 doc/environment_variables.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/environment_variables.md b/doc/environment_variables.md
index 7b222b9abf..a283a5ab00 100644
--- a/doc/environment_variables.md
+++ b/doc/environment_variables.md
@@ -85,6 +85,11 @@ some configuration as environment variables that can be set.
   'all' can additionally be used to turn all traces on.
   Individual traces can be disabled by prefixing them with '-'.
 
+  'refcount' will turn on all of the tracers for refcount debugging.
+
+  if 'list_tracers' is present, then all of the available tracers will be
+  printed when the program starts up.
+
   Example:
   export GRPC_TRACE=all,-pending_tags
 
-- 
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