Support sdist.
diff --git a/Tools/idle/MANIFEST.in b/Tools/idle/MANIFEST.in
new file mode 100644
index 0000000..440c9d1
--- /dev/null
+++ b/Tools/idle/MANIFEST.in
@@ -0,0 +1,4 @@
+include *.txt
+include idle
+include MANIFEST.in
+include MANIFEST
\ No newline at end of file