diff --git a/doc/src/sgml/brin.sgml b/doc/src/sgml/brin.sgml
index d7f1af7819..4c5eeb875f 100644
--- a/doc/src/sgml/brin.sgml
+++ b/doc/src/sgml/brin.sgml
@@ -562,7 +562,7 @@ typedef struct BrinOpcInfo
   </varlistentry>
  </variablelist>

  [-Optionally, an-]{+An+} operator class for <acronym>BRIN</acronym> can [-supply-]{+optionally specify+} the
  following method:

  <variablelist>
@@ -570,22 +570,22 @@ typedef struct BrinOpcInfo
     <term><function>void options(local_relopts *relopts)</function></term>
     <listitem>
      <para>
       Defines {+a+} set of user-visible parameters that control operator class
       behavior.
      </para>

      <para>
       The <function>options</function> function [-has given-]{+is passed a+} pointer to {+a+}
       <replaceable>local_relopts</replaceable> struct, which needs to be
       filled with a set of operator class specific options.  The options
       can be accessed from other support functions using {+the+}
       <literal>PG_HAS_OPCLASS_OPTIONS()</literal> and
       <literal>PG_GET_OPCLASS_OPTIONS()</literal> macros.
      </para>

      <para>
       Since both key extraction [-for-]{+of+} indexed [-value-]{+values+} and representation of the
       key in <acronym>GIN</acronym> are flexible, [-it-]{+they+} may [-depends-]{+depend+} on
       user-specified parameters.
      </para>
     </listitem>
diff --git a/doc/src/sgml/btree.sgml b/doc/src/sgml/btree.sgml
index 2c4dd48ea3..b17b166e84 100644
--- a/doc/src/sgml/btree.sgml
+++ b/doc/src/sgml/btree.sgml
@@ -557,7 +557,7 @@ equalimage(<replaceable>opcintype</replaceable> <type>oid</type>) returns bool
     Optionally, a B-tree operator family may provide
     <function>options</function> (<quote>operator class specific
     options</quote>) support functions, registered under support
     function number 5.  These functions define {+a+} set of user-visible
     parameters that control operator class behavior.
    </para>
    <para>
@@ -566,19 +566,19 @@ equalimage(<replaceable>opcintype</replaceable> <type>oid</type>) returns bool