tets

1 files changed, 10 insertions, 3 deletions

diff --git a/Doc/c-api/exceptions.rst b/Doc/c-api/exceptions.rst
index 33b4439..46033ca 100644
--- a/Doc/c-api/exceptions.rst
+++ b/Doc/c-api/exceptions.rst
@@ -443,13 +443,20 @@ in various ways.  There is a separate error indicator for each thread.
 
 .. c:function:: int PySignal_SetWakeupFd(int fd)
 
-   This utility function specifies a file descriptor to which a ``'\0'`` byte will
-   be written whenever a signal is received.  It returns the previous such file
-   descriptor.  The value ``-1`` disables the feature; this is the initial state.
+   This utility function specifies a file descriptor to which the signal number
+   is written as a single byte whenever a signal is received. *fd* must be
+   non-blocking. It returns the previous such file descriptor.
+
+   On Windows, the function only supports socket handles.
+
+   The value ``-1`` disables the feature; this is the initial state.
    This is equivalent to :func:`signal.set_wakeup_fd` in Python, but without any
    error checking.  *fd* should be a valid file descriptor.  The function should
    only be called from the main thread.
 
+   .. versionchanged:: 3.5
+      On Windows, the function now only supports socket handles.
+
 
 .. c:function:: PyObject* PyErr_NewException(char *name, PyObject *base, PyObject *dict)