diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 053d4dc650..8dd63c0455 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -5604,7 +5604,7 @@ substring('foobar' similar '#"o_b#"%' escape '#')    <lineannotation>NULL</linea
         <returnvalue>boolean</returnvalue>
        </para>
        <para>
-        String matches regular expression, case insensitively
+        String matches regular expression, case-insensitively
        </para>
        <para>
         <literal>'thomas' ~* 'T.*ma'</literal>
@@ -5632,7 +5632,7 @@ substring('foobar' similar '#"o_b#"%' escape '#')    <lineannotation>NULL</linea
         <returnvalue>boolean</returnvalue>
        </para>
        <para>
-        String does not match regular expression, case insensitively
+        String does not match regular expression, case-insensitively
        </para>
        <para>
         <literal>'thomas' !~* 'T.*ma'</literal>
diff --git a/doc/src/sgml/query.sgml b/doc/src/sgml/query.sgml
index 71d644f432..6f31a5a1d6 100644
--- a/doc/src/sgml/query.sgml
+++ b/doc/src/sgml/query.sgml
@@ -134,7 +134,7 @@ CREATE TABLE weather (
     differently than above, or even all on one line.  Two dashes
     (<quote><literal>--</literal></quote>) introduce comments.
     Whatever follows them is ignored up to the end of the line.  SQL
-    is case insensitive about key words and identifiers, except
+    is case-insensitive about key words and identifiers, except
     when identifiers are double-quoted to preserve the case (not done
     above).
    </para>
diff --git a/doc/src/sgml/syntax.sgml b/doc/src/sgml/syntax.sgml
index a99c24373e..93ad71737f 100644
--- a/doc/src/sgml/syntax.sgml
+++ b/doc/src/sgml/syntax.sgml
@@ -144,7 +144,7 @@ INSERT INTO MY_TABLE VALUES (3, 'hi there');
      <primary>case sensitivity</primary>
      <secondary>of SQL commands</secondary>
     </indexterm>
-    Key words and unquoted identifiers are case insensitive.  Therefore:
+    Key words and unquoted identifiers are case-insensitive.  Therefore:
 <programlisting>
 UPDATE MY_TABLE SET A = 5;
 </programlisting>