From d70a3b1ec21a32f7fbf0881fe4a9d87345e675b3 Mon Sep 17 00:00:00 2001
From: Martin Geisler <martin@geisler.net>
Date: Mon, 30 Oct 2017 23:29:28 +0100
Subject: [PATCH] Explain why we are not using 'cache: cargo' with Travis

---
 .travis.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index e8c14d24a..6e7767feb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,10 @@ dist: trusty
 git:
   depth: 1
 
+# Using 'cache: cargo' to cache target/ and all of $HOME/.cargo/
+# doesn't work well: the cache is large and it takes several minutes
+# to move it to and from S3. So instead we only cache the mdbook
+# binary.
 cache:
   directories:
     - $HOME/.cargo/bin/
-- 
2.39.5