diff --git a/.env.example b/.env.example
index d1221fb..57e81c7 100644
--- a/.env.example
+++ b/.env.example
@@ -9,3 +9,6 @@ PROXY_NETWORK=proxy
 
 # update interval in seconds (30 days)
 UPDATE_INTERVAL_SECONDS=2592000
+
+# PeeringDB info_type filter (should match PeeringDB values)
+PDB_INFO_TYPE=Educational/Research