Added hints about building your own DLL.
diff --git a/PCbuild/readme.txt b/PCbuild/readme.txt
index 71e46be..054ed78 100644
--- a/PCbuild/readme.txt
+++ b/PCbuild/readme.txt
@@ -27,3 +27,12 @@
When using the Debug setting, the output files have a _d added to
their name: python15_d.dll, python_d.exe, parser_d.pyd, and so on.
+
+If you want to create your own extension module DLL, there's an
+example with easy-to-follow instructions in ../PC/example/; read the
+file readme.txt there first.
+
+Pointers:
+Tcl/Tk http://sunscript.sun.com/ or http://www.scriptics.com
+zlib http://www.winimage.com/zLibDll
+bsddb Sam Rushing's web/ftp site