diff --git a/doc/src/sgml/advanced.sgml b/doc/src/sgml/advanced.sgml
index 784b40a..9cb7173 100644
--- a/doc/src/sgml/advanced.sgml
+++ b/doc/src/sgml/advanced.sgml
@@ -371,7 +371,7 @@ SELECT depname, empno, salary, avg(salary) OVER (PARTITION BY depname) FROM emps
 
    <para>
     A window function call always contains an <literal>OVER</> clause
-    following the window function's name and argument(s).  This is what
+    directly following the window function's name and argument(s).  This is what
     syntactically distinguishes it from a regular function or aggregate
     function.  The <literal>OVER</> clause determines exactly how the
     rows of the query are split up for processing by the window function.
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 04769f1..88345ec 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -11184,8 +11184,8 @@ SELECT xmlagg(x) FROM (SELECT x FROM test ORDER BY y DESC) AS tab;
   <para>
    The built-in window functions are listed in
    <xref linkend="functions-window-table">.  Note that these functions
-   <emphasis>must</> be invoked using window function syntax; that is an
-   <literal>OVER</> clause is required.
+   <emphasis>must</> be invoked using window function syntax; that is must
+   be immediately followed by an <literal>OVER</> clause.
   </para>
 
   <para>