diff --git a/.gitignore b/.gitignore
index 4861dc3..843a564 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ schedule.de.xml
 .frames
 .gen.svg
 snapshot-*.png
+env
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..a65a85b
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,2 @@
+cssutils==1.0.1
+lxml==3.4.4