diff --git a/functions/filesystem.xml b/functions/filesystem.xml
index 63d8e281ce..a04d382b40 100644
--- a/functions/filesystem.xml
+++ b/functions/filesystem.xml
@@ -188,7 +188,7 @@ chmod ("/somedir/somefile", 0755);  // octal; correct value of mode
      Affected functions include <function>stat</function>,
      <function>lstat</function>,
      <function>file_exists</function>,
-     <function>is_writeable</function>,
+     <function>is_writable</function>,
      <function>is_readable</function>,
      <function>is_executable</function>,
      <function>is_file</function>,
@@ -1749,26 +1749,26 @@ if($fp){
      <function>clearstatcache</function> for more details.
     </para>
     <para>
-     See also <function>is_writeable</function>.
+     See also <function>is_writable</function>.
     </para>
    </refsect1>
   </refentry>
 
-  <refentry id="function.is-writeable">
+  <refentry id="function.is-writable">
    <refnamediv>
-    <refname>is_writeable</refname>
-    <refpurpose>Tells whether the filename is writeable</refpurpose>
+    <refname>is_writable</refname>
+    <refpurpose>Tells whether the filename is writable</refpurpose>
    </refnamediv>
    <refsect1>
     <title>Description</title>
     <funcsynopsis>
      <funcprototype>
-      <funcdef>bool <function>is_writeable</function></funcdef>
+      <funcdef>bool <function>is_writable</function></funcdef>
       <paramdef>string <parameter>filename</parameter></paramdef>
      </funcprototype>
     </funcsynopsis>
     <para>
-     Returns true if the filename exists and is writeable.  The
+     Returns true if the filename exists and is writable.  The
      filename argument may be a directory name allowing you to check
      if a directory is writeable.
     </para>