diff --git a/filter_plugins/resolve_filter.py b/filter_plugins/resolve_filter.py
index 3ebe9e2..4e0a85c 100644
--- a/filter_plugins/resolve_filter.py
+++ b/filter_plugins/resolve_filter.py
@@ -1,5 +1,5 @@
 # Install dependencies:
-# apt-get install python-dnspython
+# apt-get install python-dnspython python3-dnspython
 import dns.resolver
 
 class FilterModule (object):