PEP 3147
diff --git a/Doc/library/py_compile.rst b/Doc/library/py_compile.rst
index c4f7229..c6eea84 100644
--- a/Doc/library/py_compile.rst
+++ b/Doc/library/py_compile.rst
@@ -26,12 +26,16 @@
Compile a source file to byte-code and write out the byte-code cache file. The
source code is loaded from the file name *file*. The byte-code is written to
- *cfile*, which defaults to *file* ``+`` ``'c'`` (``'o'`` if optimization is
- enabled in the current interpreter). If *dfile* is specified, it is used as the
+ *cfile*, which defaults to the :PEP:`3147` path, ending in ``.pyc``
+ (``'.pyo`` if optimization is enabled in the current interpreter). For
+ example, if *file* is ``/foo/bar/baz.py`` *cfile* will default to
+ ``/foo/bar/__pycache__/baz.cpython-32.pyc`` for Python 3.2. If *dfile* is specified, it is used as the
name of the source file in error messages instead of *file*. If *doraise* is
true, a :exc:`PyCompileError` is raised when an error is encountered while
compiling *file*. If *doraise* is false (the default), an error string is
- written to ``sys.stderr``, but no exception is raised.
+ written to ``sys.stderr``, but no exception is raised. This function
+ returns the path to byte-compiled file, i.e. whatever *cfile* value was
+ used.
.. function:: main(args=None)