lizhanhui commented on a change in pull request #1:
URL: https://github.com/apache/rocketmq-apis/pull/1#discussion_r720611378



##########
File path: README.md
##########
@@ -1 +1,13 @@
-# rocketmq-apis
+## Overview
+
+## Extension Spec
+
+## Message Model
+
+## Producer Flow
+
+## Consumer Flow
+
+## Reserved Fields
+
+This API spec has reserved the numeric value of PB enum to 64 and the field 
numeric value of PB message to 64. These reserved values will be used by 
RocketMQ's official implementation. Beyond the reserved values are free to use 
by external organizations.

Review comment:
       Messages and enumerations of the API spec reserve the first 64 fields 
for the evolution of RocketMQ exclusively. Vendor-specific extensions to the 
protocol are supposed to use fields beyond 64. 




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