diff --git a/SPECIFICATION.md b/SPECIFICATION.md
index 305c880..f2d30d3 100644
--- a/SPECIFICATION.md
+++ b/SPECIFICATION.md
@@ -118,7 +118,7 @@ scripts and JS injections. It returns a JSON response with the following data:
 ```json
 {
     "description": "(example) The Reference Pool allows you to pool with low fees, paying out daily using Chia.",
-    "fee": 0.01,
+    "fee": "0.01",
     "logo_url": "https://www.chia.net/img/chia_logo.svg",
     "minimum_difficulty": 10,
     "name": "The Reference Pool",