diff --git a/src/cargo/cargo.rs b/src/cargo/cargo.rs
index 83ede212233f..c92d6d8a1871 100644
--- a/src/cargo/cargo.rs
+++ b/src/cargo/cargo.rs
@@ -16,6 +16,8 @@
 import vec;
 import getopts::{optflag, optopt, opt_present};
 
+// FIXME: Make these fields imm
+
 type package = {
     mut name: str,
     mut uuid: str,