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diff --git a/doc/environment_variables.md b/doc/environment_variables.md
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@@ -67,7 +67,9 @@ some configuration as environment variables that can be set.
- ERROR - log only errors
* GRPC_DNS_RESOLVER
- Declares which DNS resolver to use. Available DNS resolver include:
+ Declares which DNS resolver to use. The default is ares if gRPC is built with
+ c-ares support. Otherwise, the value of this environment variable is ignored.
+ Available DNS resolver include:
- ares (default) - a DNS resolver based around the c-ares library
- native - a DNS resolver based around getaddrinfo(), creates a new thread to
perform name resolution