diff --git a/ci/build.sh b/ci/build.sh
index 72d11ef..4339483 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -14,8 +14,16 @@ build_package() {
     PRODUCTION=1 npm run webpack
 }
 
+build_info() {
+    VERSION=$(git describe --tags --always)
+    echo "version: ${VERSION}" >> dist/version-info.txt
+    echo "time: $(TZ=UTC date +'%Y-%m-%d %H:%M')" >> dist/version-info.txt
+    if [ -n "$TRAVIS" ]; then
+        echo "build id: TRAVIS ${TRAVIS_JOB_NUMBER} (${TRAVIS_BUILD_ID})" >> dist/version-info.txt
+    fi
+}
+
 
 install_closure
 build_package
-
-ls dist/
+build_info
diff --git a/ci/deploy.py b/ci/deploy.py
index 4fe40f4..7ba88b9 100755
--- a/ci/deploy.py
+++ b/ci/deploy.py
@@ -12,6 +12,7 @@ UPLOAD_ORDER = [
 
 CACHE_RULES = [
     (re.compile(r'.*\.html$'), "public, max-age=120"),
+    (re.compile(r'^version-info\.txt$'), "public, max-age=60"),
     (re.compile(r'.*\.(css|js)$'), "public, s-maxage=31536000, max-age=86400")
 ]