diff --git a/.travis.yml b/.travis.yml
index c180188..d595b25 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,9 @@ matrix:
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
     - rust: nightly
       if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
+    # MSRV
+    - rust: 1.31.0
+      if: (branch = staging OR branch = trying) OR (type = pull_request AND branch = master)
 
 branches:
   only:
diff --git a/README.md b/README.md
index fa8e4a7..4be6f86 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,11 @@ MSP430, and RISCV teams][teams].
 
 ## [Change log](CHANGELOG.md)
 
+## Minimum Supported Rust Version (MSRV)
+
+This crate is guaranteed to compile on stable Rust 1.31.0 and up. It *might*
+compile with older versions but that may change in any new patch release.
+
 ## License
 
 Licensed under either of