diff --git a/doc/src/sgml/ref/create_index.sgml b/doc/src/sgml/ref/create_index.sgml
index 30bb38bf62..06fc6ddaa0 100644
--- a/doc/src/sgml/ref/create_index.sgml
+++ b/doc/src/sgml/ref/create_index.sgml
@@ -615,6 +615,12 @@ Indexes:
     within a transaction block, but <command>CREATE INDEX CONCURRENTLY</command>
     cannot.
    </para>
+
+   <para>
+    Concurrent builds for indexes on partitioned tables are currently not
+    supported.
+   </para>
+
   </refsect2>
  </refsect1>