diff --git a/pep-0387.txt b/pep-0387.txt
index aa65adbca..04f765eb7 100644
--- a/pep-0387.txt
+++ b/pep-0387.txt
@@ -55,6 +55,9 @@ be removed at any time in any way.  These include:
 
 - Inheritance patterns of internal classes.
 
+- Test suites.  (Anything in the Lib/test directory or test
+  subdirectories of packages.)
+
 This is the basic policy for backwards compatibility:
 
 * Unless it is going through the deprecation process below, the