diff --git a/Dockerfile b/Dockerfile
index f4899490..00fe2e20 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,6 +15,7 @@ RUN apt-get -y update && \
 	    php5-mysql \
 	    php5-mcrypt \
 	    libmcrypt-dev \
+	    libwww-perl \
 	    pwgen \
 	    openssl \
     && \
diff --git a/README.md b/README.md
index 9bb814e8..821cd00b 100644
--- a/README.md
+++ b/README.md
@@ -81,6 +81,7 @@ CONNTRACK states.
 * `php-fpm` with `mysql` module;
 * `openssl` and `pwgen` for client certificat generation;
 * `mcrypt`;
+* `HTTP::Request::Common` perl module;
 * `Mcrypt` from CPAN (`cpan -i Mcrypt`, on Debian, it requires `libtool` and
   `build-essential`) to decrypt submissions (see
   https://metacpan.org/pod/Mcrypt);