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-rw-r--r--.travis.yml6
1 files changed, 6 insertions, 0 deletions
diff --git a/.travis.yml b/.travis.yml
index 3d1c7f0d7e..51c7d19c07 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,6 +6,12 @@ language: c
 compiler:
   - gcc
 cache:
+  # There is one cache per branch and compiler version.
+  # characteristics of each job are used to identify the cache:
+  # - OS name (currently, linux, osx, or windows)
+  # - OS distribution (for Linux, xenial, trusty, or precise)
+  # - macOS image name (e.g., xcode7.2)
+  # - Names and values of visible environment variables set in .travis.yml or Settings panel
   timeout: 1200
   ccache: true
   pip: true