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-rw-r--r--Doc/extending/extending.rst7
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diff --git a/Doc/extending/extending.rst b/Doc/extending/extending.rst
index 497180a..980d407 100644
--- a/Doc/extending/extending.rst
+++ b/Doc/extending/extending.rst
@@ -20,6 +20,13 @@ source file by including the header ``"Python.h"``.
The compilation of an extension module depends on its intended use as well as on
your system setup; details are given in later chapters.
+Do note that if your use case is calling C library functions or system calls,
+you should consider using the :mod:`ctypes` module rather than writing custom
+C code. Not only does :mod:`ctypes` let you write Python code to interface
+with C code, but it is more portable between implementations of Python than
+writing and compiling an extension module which typically ties you to CPython.
+
+
.. _extending-simpleexample: