Issue #18668: Further clarify m_size setting for non-negative values
diff --git a/Doc/c-api/module.rst b/Doc/c-api/module.rst
index 92bfd5e..26c4384 100644
--- a/Doc/c-api/module.rst
+++ b/Doc/c-api/module.rst
@@ -198,10 +198,10 @@
freed when the module object is deallocated, after the :c:member:`m_free`
function has been called, if present.
- Setting ``m_size`` to a positive value specifies the size of the additional
- memory required by the module. Setting it to ``-1`` means that the module can
- not be re-initialized because it has global state. Setting it to ``0`` is
- forbidden.
+ Setting ``m_size`` to ``-1`` means that the module can not be
+ re-initialized because it has global state. Setting it to a non-negative
+ value means that the module can be re-initialized and specifies the
+ additional amount of memory it requires for its state.
See :PEP:`3121` for more details.