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diff --git a/doc/environment_variables.md b/doc/environment_variables.md
index 4796ad067d..5f0042e2eb 100644
--- a/doc/environment_variables.md
+++ b/doc/environment_variables.md
@@ -80,6 +80,7 @@ some configuration as environment variables that can be set.
- closure - tracks closure creation, scheduling, and completion
- pending_tags - traces still-in-progress tags on completion queues
- polling - traces the selected polling engine
+ - polling_api - traces the api calls to polling engine
- queue_refcount
- error_refcount
- stream_refcount