Update READMEs to add more details about running examples
diff --git a/examples/README.rst b/examples/README.rst
index a828cce..5e7251e 100644
--- a/examples/README.rst
+++ b/examples/README.rst
@@ -1 +1,8 @@
-Run these examples from the root directory of pycparser
+Run these examples from the root directory of pycparser.
+
+Please note that most realistic C code samples would require running the C
+preprocessor before passing the code to **pycparser**; see the `README file
+<https://github.com/eliben/pycparser/blob/master/README.rst>`_ and `this blog
+post
+<https://eli.thegreenplace.net/2015/on-parsing-c-type-declarations-and-fake-headersfor
+more details.
