diff --git a/Dockerfile b/Dockerfile
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+++ b/Dockerfile
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+# ==============================================================
+#  ____  _   _ ____            _         _        _
+# |  _ \| | | |  _ \ _ __ ___ | |__  ___| |_ _ __(_)_ __   __ _
+# | |_) | |_| | |_) | '_ ` _ \| '_ \/ __| __| '__| | '_ \ / _` |
+# |  __/|  _  |  __/| | | | | | |_) \__ \ |_| |  | | | | | (_| |
+# |_|   |_| |_|_|   |_| |_| |_|_.__/|___/\__|_|  |_|_| |_|\__, |
+#                                                         |___/
+# Dockerfile for drone.io php CI
+
+FROM php:5
+RUN docker-php-ext-install mbstring
+