diff -r 14c1ff6a8086 Doc/library/http.server.rst
--- a/Doc/library/http.server.rst	Tue Mar 11 08:12:48 2014 +0100
+++ b/Doc/library/http.server.rst	Thu Mar 13 09:54:52 2014 +0100
@@ -110,13 +110,16 @@
 
    .. 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 :attr:`responses` class variable.
+      Specifies a format string that should be used as a template for building 
+      an error response to the client. String accepts a dictionary that consists 
+      of following items: *code*, *message* and *explain*. The *code* item in the 
+      dictionary is a numeric error code. The *message* item is a short 
+      message from the *responses* dictionary or your own short message that 
+      describes an error. The *explain* item is a long message from the 
+      *responses* dictionary or you own message where you can provide more details
+      (see :attr:`send_error` and :attr:`responses` class variables). For example,
+      ``error_message_format % {'code': code, 'message': shortmessage,``
+      ``'explain': longmessage}``.     
 
    .. attribute:: error_content_type