diff --git a/doc/src/sgml/ref/alter_table.sgml b/doc/src/sgml/ref/alter_table.sgml
index ec6b4c33113..f13a6cd944d 100644
--- a/doc/src/sgml/ref/alter_table.sgml
+++ b/doc/src/sgml/ref/alter_table.sgml
@@ -372,6 +372,11 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
       tables may not be declared <literal>NOT VALID</literal> at present.
      </para>
 
+     <para>
+      The addition of a foreign key constraint requires a
+      <literal>SHARE ROW EXCLUSIVE</literal> lock on the referenced table.
+     </para>
+
      <para>
       Additional restrictions apply when unique or primary key constraints
       are added to partitioned tables; see <xref linkend="sql-createtable" />.
diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml
index 5a19f94ce91..10428f8ff03 100644
--- a/doc/src/sgml/ref/create_table.sgml
+++ b/doc/src/sgml/ref/create_table.sgml
@@ -992,7 +992,9 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
       is used.  The referenced columns must be the columns of a non-deferrable
       unique or primary key constraint in the referenced table.  The user
       must have <literal>REFERENCES</literal> permission on the referenced table
-      (either the whole table, or the specific referenced columns).
+      (either the whole table, or the specific referenced columns).  The
+      addition of a foreign key constraint requires a
+      <literal>SHARE ROW EXCLUSIVE</literal> lock on the referenced table.
       Note that foreign key constraints cannot be defined between temporary
       tables and permanent tables.  Also note that while it is possible to
       define a foreign key on a partitioned table, it is not possible to