diff --git a/doc/src/sgml/ref/pg_rewind.sgml b/doc/src/sgml/ref/pg_rewind.sgml
index 9118f05bf26..15cddd086b7 100644
--- a/doc/src/sgml/ref/pg_rewind.sgml
+++ b/doc/src/sgml/ref/pg_rewind.sgml
@@ -103,7 +103,7 @@ PostgreSQL documentation
   </para>
 
   <warning>
-   <title>Warning: Failures while Rewinding</title>
+   <title>Warning: Failures While Rewinding</title>
    <para>
     If <application>pg_rewind</application> fails while processing, then
     the data folder of the target is likely not in a state that can be
diff --git a/doc/src/sgml/ref/select.sgml b/doc/src/sgml/ref/select.sgml
index 1f9538f2feb..0ee0cc7e641 100644
--- a/doc/src/sgml/ref/select.sgml
+++ b/doc/src/sgml/ref/select.sgml
@@ -2044,7 +2044,7 @@ SELECT 2+2;
   </refsect2>
 
   <refsect2>
-   <title>Omitting sub-<command>SELECT</command> aliases in <literal>FROM</literal></title>
+   <title>Omitting Sub-<command>SELECT</command> Aliases in <literal>FROM</literal></title>
 
    <para>
     According to the SQL standard, a sub-<command>SELECT</command> in the
diff --git a/doc/src/sgml/regress.sgml b/doc/src/sgml/regress.sgml
index f721694230f..88a43b8961b 100644
--- a/doc/src/sgml/regress.sgml
+++ b/doc/src/sgml/regress.sgml
@@ -806,7 +806,7 @@ make check PROVE_TESTS='t/001_test1.pl t/003_test3.pl'
    </para>
 
   <sect2 id="regress-tap-vars">
-   <title>Environment variables</title>
+   <title>Environment Variables</title>
 
    <para>
     Data directories are named according to the test filename, and will be