Horde_Translation::r(), not r().

horde/docs/TRANSLATIONS

@@ -382,7 +382,7 @@ To have your own string (e.g. that you added to config files) displayed in
 several languages, you have to
 
   1. specify your texts as gettext arguments, in English, e.g. by using the
-     _() or r() function.
+     _() function or Horde_Translation methods.
   2. edit the translation files for the required national languages,
   3. compile those translation files.
 
@@ -419,12 +419,12 @@ screen:
 ~~~~~~~~~~~~~~~~~~~~~
 
 Horde provides a non-standard way to define a translatable string without
-having that string translated in the code.  By using the r() method, the
-string will be marked as a translatable string and extracted by the Horde
-translation script, but the string will not be altered in the PHP code.
+having that string translated in the code.  By using the Horde_Translation::r()
+method, the string will be marked as a translatable string and extracted by the
+Horde translation script, but the string will not be altered in the PHP code.
 Example::
 
-  $str = r("Foo");
+  $str = Horde_Translation::r("Foo");
   echo $str; // Output: Foo
   echo _($str); // Output: [Translation of 'Foo']