diff -r 0e07ab605e0b Doc/library/json.rst
--- a/Doc/library/json.rst	Sun Dec 15 20:56:00 2013 -0500
+++ b/Doc/library/json.rst	Mon Dec 16 16:42:17 2013 +0800
@@ -226,7 +226,10 @@
    *parse_float*, if specified, will be called with the string of every JSON
    float to be decoded.  By default, this is equivalent to ``float(num_str)``.
    This can be used to use another datatype or parser for JSON floats
-   (e.g. :class:`decimal.Decimal`).
+   (e.g. :class:`decimal.Decimal`). Note that this does not mean we can pass
+   non-valid JSON number string but valid Python number string, such as '.5'
+   to JSON parser because *parse_float* will be only triggered after the number
+   string is tokenized.
 
    *parse_int*, if specified, will be called with the string of every JSON int
    to be decoded.  By default, this is equivalent to ``int(num_str)``.  This can
@@ -312,7 +315,10 @@
    *parse_float*, if specified, will be called with the string of every JSON
    float to be decoded.  By default, this is equivalent to ``float(num_str)``.
    This can be used to use another datatype or parser for JSON floats
-   (e.g. :class:`decimal.Decimal`).
+   (e.g. :class:`decimal.Decimal`). Note that this does not mean we can pass
+   non-valid JSON number string but valid Python number string, such as '.5'
+   to JSON parser because *parse_float* will be only triggered after the number
+   string is tokenized.
 
    *parse_int*, if specified, will be called with the string of every JSON int
    to be decoded.  By default, this is equivalent to ``int(num_str)``.  This can