diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
index d54ecd75a2628f..428ce51165c9b5 100644
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -604,12 +604,18 @@ always available.
+---------------------+----------------+--------------------------------------------------+
| :const:`radix` | FLT_RADIX | radix of exponent representation |
+---------------------+----------------+--------------------------------------------------+
- | :const:`rounds` | FLT_ROUNDS | integer constant representing the rounding mode |
- | | | used for arithmetic operations. This reflects |
- | | | the value of the system FLT_ROUNDS macro at |
- | | | interpreter startup time. See section 5.2.4.2.2 |
- | | | of the C99 standard for an explanation of the |
- | | | possible values and their meanings. |
+ | :const:`rounds` | FLT_ROUNDS | integer representing the rounding mode for |
+ | | | floating-point arithmetic. This reflects the |
+ | | | value of the system FLT_ROUNDS macro at |
+ | | | interpreter startup time: |
+ | | | ``-1`` indeterminable, |
+ | | | ``0`` toward zero, |
+ | | | ``1`` to nearest, |
+ | | | ``2`` toward positive infinity, |
+ | | | ``3`` toward negative infinity |
+ | | | |
+ | | | All other values for FLT_ROUNDS characterize |
+ | | | implementation-defined rounding behavior. |
+---------------------+----------------+--------------------------------------------------+
The attribute :attr:`sys.float_info.dig` needs further explanation. If
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