diff --git a/src/stdio/src/lib.rs b/src/stdio/src/lib.rs
index 1c67857bd11d86d354d61f5bbeb7eff23417c675..9cdf30a7007912f4c4966ff380b4aad25551e008 100644
--- a/src/stdio/src/lib.rs
+++ b/src/stdio/src/lib.rs
@@ -1,6 +1,7 @@
 //! stdio implementation for Redox, following http://pubs.opengroup.org/onlinepubs/7908799/xsh/stdio.h.html
 
 #![no_std]
+// For Vec
 #![feature(alloc)]
 #![feature(const_fn)]