[pulsar] branch master updated: [improve][doc] Clarify the definition of message key (#15469)

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penghui pushed a commit to branch master
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The following commit(s) were added to refs/heads/master by this push:
     new e1a161bd881 [improve][doc] Clarify the definition of message key (#15469)
e1a161bd881 is described below

commit e1a161bd881412556c655736936c8cd98596e7fe
Author: momo-jun <60...@users.noreply.github.com>
AuthorDate: Sun May 8 09:41:26 2022 +0800

    [improve][doc] Clarify the definition of message key (#15469)
---
 site2/docs/concepts-messaging.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/site2/docs/concepts-messaging.md b/site2/docs/concepts-messaging.md
index f33af5545f3..a98e5eb3bd2 100644
--- a/site2/docs/concepts-messaging.md
+++ b/site2/docs/concepts-messaging.md
@@ -17,7 +17,7 @@ Messages are the basic "unit" of Pulsar. The following table lists the component
 Component | Description
 :---------|:-------
 Value / data payload | The data carried by the message. All Pulsar messages contain raw bytes, although message data can also conform to data [schemas](schema-get-started.md).
-Key | Messages are optionally tagged with keys, which is useful for things like [topic compaction](concepts-topic-compaction.md).
+Key | The key (string type) of the message. It is a short name of message key or partition key. Messages are optionally tagged with keys, which is useful for features like [topic compaction](concepts-topic-compaction.md).
 Properties | An optional key/value map of user-defined properties.
 Producer name | The name of the producer who produces the message. If you do not specify a producer name, the default name is used. 
 Topic name | The name of the topic that the message is published to.