diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml
index 39075ea8f3..54bc1abd84 100644
--- a/doc/src/sgml/maintenance.sgml
+++ b/doc/src/sgml/maintenance.sgml
@@ -707,7 +707,7 @@ HINT:  Stop the postmaster and vacuum that database in single-user mode.
    </sect3>
   </sect2>
 
-  <sect2 id="autovacuum">
+  <sect2 id="autovacuum" xreflabel="autovacuum">
    <title>The Autovacuum Daemon</title>
 
    <indexterm>
diff --git a/doc/src/sgml/spgist.sgml b/doc/src/sgml/spgist.sgml
index 0e04a08679..edf4a67e52 100644
--- a/doc/src/sgml/spgist.sgml
+++ b/doc/src/sgml/spgist.sgml
@@ -1,6 +1,6 @@
 <!-- doc/src/sgml/spgist.sgml -->
 
-<chapter id="spgist">
+<chapter id="spgist" xreflabel="SP-GiST">
 <title>SP-GiST Indexes</title>
 
    <indexterm>
diff --git a/doc/src/sgml/storage.sgml b/doc/src/sgml/storage.sgml
index 3234adb639..ea08d0b614 100644
--- a/doc/src/sgml/storage.sgml
+++ b/doc/src/sgml/storage.sgml
@@ -301,7 +301,7 @@ where <replaceable>PPP</replaceable> is the PID of the owning backend and
 
 </sect1>
 
-<sect1 id="storage-toast">
+<sect1 id="storage-toast" xreflabel="TOAST">
 
 <title>TOAST</title>