diff -r d975f50de5aa Doc/library/http.server.rst
--- a/Doc/library/http.server.rst	Mon Mar 10 19:26:57 2014 +0100
+++ b/Doc/library/http.server.rst	Tue Mar 18 09:28:45 2014 +0100
@@ -110,13 +110,13 @@
 
    .. attribute:: error_message_format
 
-      Specifies a format string for building an error response to the client. It
-      uses parenthesized, keyed format specifiers, so the format operand must be
-      a dictionary. The *code* key should be an integer, specifying the numeric
-      HTTP error code value. *message* should be a string containing a
-      (detailed) error message of what occurred, and *explain* should be an
-      explanation of the error code number. Default *message* and *explain*
-      values can found in the *responses* class variable.
+      Specifies a format string that should be used by :attr:`send_error` method 
+      for building an error response to the client. The string is filled by 
+      default with variables from :attr:`responses` based on the *code* that 
+      passed to :attr:`send_error`. You can also specify an alternate explain 
+      message that overrides the one from :attr:`responses` when calling 
+      :attr:`send_error` (see :attr:`send_error` method and :attr:`responses` 
+      class variable).
 
    .. attribute:: error_content_type