diff --git a/docker-prune b/docker-prune
index a8fe4f3..a6c3278 100755
--- a/docker-prune
+++ b/docker-prune
@@ -36,8 +36,15 @@ success() {
     append_msg $* 1>&2
 }
 
-# commandline parameter evaluation
+# default
 filter="until=168h"
+
+# config file overwrites
+if test -e /etc/docker-prune.conf; then
+    . /etc/docker-prune.conf
+fi
+
+# commandline parameter evaluation
 while test $# -gt 0; do
     case "$1" in
         (--help|-h) less <<EOF