diff --git a/.travis.yml b/.travis.yml
index 486d5e5..77d30d2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ env:
   - FEATURES='serde-1'
 matrix:
   include:
-    - rust: 1.18.0
+    - rust: 1.15.0
     - rust: stable
       env:
         - NODEFAULT=1
diff --git a/src/lib.rs b/src/lib.rs
index eb505d9..6e91e41 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,7 +13,9 @@
 //!   - Use the unstable feature untagged unions for the internal implementation,
 //!     which has reduced space overhead
 //!
-//! **arrayvec Requires Rust 1.18**
+//! ## Rust Version
+//!
+//! This version of arrayvec requires Rust 1.15 or later.
 //!
 #![doc(html_root_url="https://docs.rs/arrayvec/0.3/")]
 #![cfg_attr(not(feature="std"), no_std)]