diff --git a/contrib/test.sh b/contrib/test.sh
index c6f10bc..0043392 100755
--- a/contrib/test.sh
+++ b/contrib/test.sh
@@ -1,5 +1,6 @@
 #!/bin/sh -ex
 
+# TODO: Add core2 here once we bump MSRV.
 FEATURES="serde serde-std std"
 
 if [ "$DO_ALLOC_TESTS" = true ]; then