Fix name of the sha1 extension.
diff --git a/Modules/Setup.dist b/Modules/Setup.dist
index 6179c9a..3504f82 100644
--- a/Modules/Setup.dist
+++ b/Modules/Setup.dist
@@ -241,7 +241,7 @@
 
 # The _sha module implements the SHA checksum algorithms.
 # (NIST's Secure Hash Algorithms.)
-#_sha shamodule.c
+#_sha1 shamodule.c
 #_sha256 sha256module.c
 #_sha512 sha512module.c