diff --git a/src/display.rs b/src/display.rs
index a7f0847..52eec0c 100644
--- a/src/display.rs
+++ b/src/display.rs
@@ -9,9 +9,7 @@
 
 #![allow(non_upper_case_globals)]
 
-// this file defines CGFloat, as well as stubbed data types.
 extern crate core_foundation;
-// extern crate core_foundation_sys;
 
 pub use libc;
 pub use base::{CGError, boolean_t};