JingsongLi commented on code in PR #1139:
URL: https://github.com/apache/incubator-paimon/pull/1139#discussion_r1191932396
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docs/content/how-to/altering-tables.md:
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@@ -409,3 +409,51 @@ ALTER TABLE my_table ALTER COLUMN col_a SET DATA TYPE
DOUBLE;
{{< /tab >}}
{{< /tabs >}}
+
+## Adding watermark
+
+The following SQL adds a watermark with strategy `ts - INTERVAL '1' HOUR` on
column `ts` which is marked as event time attribute of table `my_table`.
+
+{{< tabs "add-watermark" >}}
+
+{{< tab "Flink" >}}
+
+```sql
+ALTER TABLE my_table ADD WATERMARK FOR ts AS ts - INTERVAL '1' HOUR
Review Comment:
Can you also add an example: `add computed column` here? Sometimes watermark
is closely related to computed column.
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