diff --git a/.travis.yml b/.travis.yml
index a08cbf5..761a55f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,12 +3,10 @@ language: rust
 rust:
   - nightly
   - stable
+  # Oldest supported Rust version. Do not change this without a Github issue
+  # discussion.
   - 1.10.0
 
-os:
-  - linux
-  - osx
-
 matrix:
   allow_failures:
     - rust: nightly