Note the existence of SpecialBuilds.txt.
diff --git a/Misc/README b/Misc/README
index ded7fab..e3a8c3b 100644
--- a/Misc/README
+++ b/Misc/README
@@ -25,5 +25,6 @@
 README		The file you're reading now
 RFD		Request For Discussion about a Python newsgroup
 RPM		(Old) tools to build RPMs
+SpecialBuilds.txt     Describes extra symbols you can set for debug builds
 setuid-prog.c	C helper program for set-uid Python scripts
 vgrindefs	Python configuration for vgrind (a generic pretty printer)