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diff --git a/doc/environment_variables.md b/doc/environment_variables.md
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--- a/doc/environment_variables.md
+++ b/doc/environment_variables.md
@@ -55,6 +55,7 @@ some configuration as environment variables that can be set.
- queue_timeout
- server_channel - lightweight trace of significant server channel events
- secure_endpoint - traces bytes flowing through encrypted channels
+ - timer - timers (alarms) in the grpc internals
- transport_security - traces metadata about secure channel establishment
- tcp - traces bytes in and out of a channel