-If @var{type} is @code{nil}, then any kind of definition is
-acceptable. If @var{type} is @code{defun} or @code{defvar}, that
-specifies function definition only or variable definition only.
-
-The value is normally an absolute file name. It can also be
-@code{nil}, if the definition is not associated with any file.
+If @var{type} is @code{nil}, then any kind of definition is acceptable.
+If @var{type} is @code{defun}, @code{defvar}, or @code{defface}, that
+specifies function definition, variable definition, or face definition
+only.
+
+The value is normally an absolute file name. It can also be @code{nil},
+if the definition is not associated with any file. If @var{symbol}
+specifies an autoloaded function, the value can be a relative file name
+without extension.