update alter tag (#1108)

vesoft-inc · Feb 18, 2022 · cfcb5e4 · cfcb5e4
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diff --git a/docs-2.0/15.contribution/how-to-contribute.md b/docs-2.0/15.contribution/how-to-contribute.md
@@ -192,7 +192,7 @@ For detailed methods, see [How to add test cases](https://github.com/vesoft-inc/
 
 ### Step 1: Confirm the project donation
 
-Contact the official Nebula Graph staff via email, WeChat, Slack, etc. to confirm the donation project. The project will be donated to the Nebula Contrib organization.
+Contact the official Nebula Graph staff via email, WeChat, Slack, etc. to confirm the donation project. The project will be donated to the [Nebula Contrib organization](https://github.com/nebula-contrib).
 
 Email address: info@vesoft.com
 

diff --git a/docs-2.0/3.ngql-guide/10.tag-statements/3.alter-tag.md b/docs-2.0/3.ngql-guide/10.tag-statements/3.alter-tag.md
@@ -17,9 +17,9 @@ ALTER TAG <tag_name>
     [COMMENT = '<comment>'];
 
 alter_definition:
-| ADD    (prop_name data_type)
+| ADD    (prop_name data_type [NULL | NOT NULL] [DEFAULT <default_value>] [COMMENT '<comment>'])
 | DROP   (prop_name)
-| CHANGE (prop_name data_type)
+| CHANGE (prop_name data_type [NULL | NOT NULL] [DEFAULT <default_value>] [COMMENT '<comment>'])
 
 ttl_definition:
     TTL_DURATION = ttl_duration, TTL_COL = prop_name
@@ -36,6 +36,7 @@ nebula> CREATE TAG IF NOT EXISTS t1 (p1 string, p2 int);
 nebula> ALTER TAG t1 ADD (p3 int, p4 string);
 nebula> ALTER TAG t1 TTL_DURATION = 2, TTL_COL = "p2";
 nebula> ALTER TAG t1 COMMENT = 'test1';
+nebula> ALTER TAG t1 ADD (p5 double NOT NULL DEFAULT 0.4 COMMENT 'p5') COMMENT='test2';
 ```
 
 ## Implementation of the operation