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-rw-r--r--doc/src/sgml/ref/insert.sgml5
1 files changed, 5 insertions, 0 deletions
diff --git a/doc/src/sgml/ref/insert.sgml b/doc/src/sgml/ref/insert.sgml
index a9af9959c08..29e92546ef4 100644
--- a/doc/src/sgml/ref/insert.sgml
+++ b/doc/src/sgml/ref/insert.sgml
@@ -75,6 +75,11 @@ INSERT INTO <replaceable class="parameter">table_name</replaceable> [ AS <replac
</para>
<para>
+ <command>INSERT</command> into tables that lack unique indexes will
+ not be blocked by concurrent activity. Tables with unique indexes
+ might block if concurrent sessions perform actions that lock or modify
+ rows matching the unique index values being inserted; the details
+ are covered in <xref linkend="index-unique-checks"/>.
<literal>ON CONFLICT</literal> can be used to specify an alternative
action to raising a unique constraint or exclusion constraint
violation error. (See <xref linkend="sql-on-conflict"/> below.)