diff --git a/doc/src/sgml/ref/drop_index.sgml b/doc/src/sgml/ref/drop_index.sgml
index 85cf23bca2..b6d2c2014f 100644
--- a/doc/src/sgml/ref/drop_index.sgml
+++ b/doc/src/sgml/ref/drop_index.sgml
@@ -45,7 +45,7 @@ DROP INDEX [ CONCURRENTLY ] [ IF EXISTS ] <replaceable class="parameter">name</r
     <para>
      Drop the index without locking out concurrent selects, inserts, updates,
      and deletes on the index's table.  A normal <command>DROP INDEX</command>
      acquires {+an+} exclusive lock on the table, blocking other accesses until the
      index drop can be completed.  With this option, the command instead
      waits until conflicting transactions have completed.
     </para>