diff --git a/README.md b/README.md
index ba20ab2..662861b 100644
--- a/README.md
+++ b/README.md
@@ -51,16 +51,16 @@ cat /etc/nftables.d/addons/failover.nft
     {
       "failover": {
         "endpoint_filer": {
-          "ip4": ['192.168.87.100', '192.168.87.101'],
-          "ip6": ['2001:DB8:2:2', '2001:DB8:2:3'],
+          "ip4": ["192.168.87.100", "192.168.87.101"],
+          "ip6": ["2001:DB8:2:2", "2001:DB8:2:3"],
           "port": 443
         },
         "endpoint_print": {
-          "ip4": ['192.168.93.51', '192.168.93.52'],
+          "ip4": ["192.168.93.51", "192.168.93.52"],
           "port": 631
         },
         "mark_proxy": {  // set fwmark for policy routing
-          "ip4": ['192.168.132.2', '192.168.132.3'],
+          "ip4": ["192.168.132.2", "192.168.132.3"],
           "port": 3129,
           "values": [200, 201]
         }