diff --git a/docs/graphics-protocol.rst b/docs/graphics-protocol.rst
index 36e1f2375..c2259080f 100644
--- a/docs/graphics-protocol.rst
+++ b/docs/graphics-protocol.rst
@@ -226,8 +226,12 @@ Value of `t`          Meaning
                       is in a known temporary directory, such as :file:`/tmp`,
                       :file:`/dev/shm`, :file:`TMPDIR env var if present` and any platform
                       specific temporary directories.
-``s``                 A `POSIX shared memory object <http://man7.org/linux/man-pages/man7/shm_overview.7.html>`_.
-                      The terminal emulator will delete it after reading the pixel data
+``s``                 A *shared memory object*, which on POSIX systems is a `POSIX shared memory object
+                      <http://man7.org/linux/man-pages/man7/shm_overview.7.html>`_ and on Windows is a
+                      `Named shared memory object <https://docs.microsoft.com/en-us/windows/win32/memory/creating-named-shared-memory>`_.
+                      The terminal emulator must read the data from the memory
+                      object and then unlink and close it on POSIX and just
+                      close it on Windows.
 ==================    ============
 
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