diff --git a/Dockerfile b/Dockerfile
index 21d0d96..f7ce6ee 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,9 @@
 FROM python:2.7.13
 
 RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
-RUN apt-get install -y nodejs
+RUN apt-get install -y \
+    groff \
+    nodejs
 
 RUN mkdir /root/.aws
 
diff --git a/Dockerfile-python3 b/Dockerfile-python3
index a894cc3..2b9bb8b 100644
--- a/Dockerfile-python3
+++ b/Dockerfile-python3
@@ -1,7 +1,9 @@
 FROM python:3.6.2
 
 RUN curl -sL https://deb.nodesource.com/setup_8.x | bash -
-RUN apt-get install -y nodejs
+RUN apt-get install -y \
+    groff \
+    nodejs
 
 RUN mkdir /root/.aws