spacewander commented on a change in pull request #2734:
URL: https://github.com/apache/apisix/pull/2734#discussion_r522592147



##########
File path: doc/install-dependencies.md
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@@ -28,7 +28,7 @@
 
 Note
 ====
-- Since v2.0 Apache APISIX would not support the v2 protocol storage to etcd 
anymore, and the minimum etcd version supported is v3.4.0.
+- Since v2.0 Apache APISIX would not support the v2 protocol storage to etcd 
anymore, and the minimum etcd version supported is v3.4.0. What's more, etcd v3 
uses gRPC as the messaging protocol, while Apache APISIX uses HTTP(s) to 
communicate with etcd cluster, so be sure the [etcd gRPC 
gateway](https://etcd.io/docs/v3.4.0/dev-guide/api_grpc_gateway/) is enabled.

Review comment:
       `HTTP(s)`, `s` should be uppercase.




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