diff --git a/doc/src/sgml/ref/psql-ref.sgml b/doc/src/sgml/ref/psql-ref.sgml
index f945c9f394b..66122bcb4ca 100644
--- a/doc/src/sgml/ref/psql-ref.sgml
+++ b/doc/src/sgml/ref/psql-ref.sgml
@@ -1340,10 +1340,13 @@ SELECT $1 \parse stmt1
         </para>
         <para>
         As with many other commands, if <literal>x</literal> is appended to
-        the command name, the results are displayed in expanded mode, but note
-        that this only applies when <command>\d</command> is used without a
-        <replaceable class="parameter">pattern</replaceable> argument, and
-        the <literal>x</literal> modifier cannot appear immediately after the
+        the command name, the results are displayed in expanded mode for this
+        command only, but note that this only applies when <command>\d</command>
+        is used without a <replaceable class="parameter">pattern</replaceable>
+        argument or to describe a sequence.
+        The same limitation on expanded output applies to
+        <command>\x on</command> and <command>\x auto</command>.
+        The <literal>x</literal> modifier cannot appear immediately after the
         <command>\d</command> (because <command>\dx</command> is a different
         command); the <literal>x</literal> modifier may only appear after an
         <literal>S</literal> or <literal>+</literal> modifier. For example,
diff --git a/src/bin/psql/help.c b/src/bin/psql/help.c
index 9c15cb679fd..84d052e4780 100644
--- a/src/bin/psql/help.c
+++ b/src/bin/psql/help.c
@@ -220,7 +220,8 @@ slashUsage(unsigned short int pager)
 	HELP0("Informational\n");
 	HELP0("  (options: S = show system objects, x = expanded mode, + = additional detail)\n");
 	HELP0("  \\d[Sx+]                list tables, views, and sequences\n");
-	HELP0("  \\d[S+]   NAME          describe table, view, sequence, or index\n");
+	HELP0("  \\d[Sx+]  NAME          describe table, view, sequence, or index\n");
+	HELP0("                         (x applies only to sequences)\n");
 	HELP0("  \\da[Sx]  [PATTERN]     list aggregates\n");
 	HELP0("  \\dA[x+]  [PATTERN]     list access methods\n");
 	HELP0("  \\dAc[x+] [AMPTRN [TYPEPTRN]]  list operator classes\n");