diff --git a/Dockerfile b/Dockerfile
index f92f39a465ca0ead667703c7223641330d0afbcf..89322c38bba618b82dd4e96c99455eea670dff13 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,8 @@ FROM fedora:23
 
 EXPOSE 5222
 VOLUME ["/etc/spectrum2/transports", "/var/lib/spectrum2"]
+ARG commit=unknown
+RUN echo $commit
 
 # Spectrum 2
 RUN dnf install protobuf protobuf swiften gcc gcc-c++ make libpqxx-devel libpurple-devel protobuf-devel swiften-devel rpm-build avahi-devel boost-devel cmake cppunit-devel expat-devel libcommuni-devel libidn-devel libsqlite3x-devel log4cxx-devel gettext libgcrypt-devel libwebp-devel libpurple-devel zlib-devel json-glib-devel python-pip zlib-devel libjpeg-devel python-devel  mysql-devel popt-devel git libevent-devel qt-devel dbus-glib-devel libcurl-devel wget -y && \