diff --git a/scripts/travis-build.sh b/scripts/travis-build.sh
index 7558b399..fca1773e 100755
--- a/scripts/travis-build.sh
+++ b/scripts/travis-build.sh
@@ -21,6 +21,8 @@ setup_env() {
 
 # We have to do this by hand rather than use the coverity addon because of
 # matrix explosion: https://github.com/travis-ci/travis-ci/issues/1975
+# We also do it by hand because when we're throttled, the addon will exit
+# the build immediately and skip the main script!
 coverity_scan() {
   if [ "${TRAVIS_JOB_NUMBER##*.}" != "1" ] || \
      [ -n "${TRAVIS_TAG}" ] || \