diff --git a/.gitignore b/.gitignore
index c8446c6..2a8473b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,6 +9,8 @@ lerna-debug.log*
 
 # CGPS
 output
+input.csv
+whitelist.csv
 blocklist.txt
 allowlist.txt
 
diff --git a/cf_list_create.js b/cf_list_create.js
index 3b495a2..b57afea 100644
--- a/cf_list_create.js
+++ b/cf_list_create.js
@@ -1,3 +1,4 @@
+import { existsSync } from "fs";
 import { resolve } from "path";
 
 import {
@@ -18,8 +19,12 @@ import {
   readFile,
 } from "./lib/utils.js";
 
-const allowlistFilename = "allowlist.txt";
-const blocklistFilename = "blocklist.txt";
+const allowlistFilename = existsSync("whitelist.csv")
+  ? "whitelist.csv"
+  : "allowlist.txt";
+const blocklistFilename = existsSync("input.csv")
+  ? "input.csv"
+  : "blocklist.txt";
 const allowlist = new Map();
 const blocklist = new Map();
 const domains = [];