More float_ord docs

src/float_ord.rs

@@ -5,6 +5,10 @@
 /* Adapted from https://github.com/notriddle/rust-float-ord revision e995165f
  * maintained by Michael Howell <michael@notriddle.com>
  * licensed under MIT / Apache-2.0 licenses
+ * 
+ * This version drops any dependency on rand.
+ * Caution: Don't pull the version from crates.io
+ * before making sure rand is optional.
  */
 
 extern crate core;