diff --git a/402.md b/402.md
index e63e97ad..d5df9241 100644
--- a/402.md
+++ b/402.md
@@ -36,7 +36,7 @@ The following tags, used for structured metadata, are standardized and SHOULD be
 - `"price"`, for the price of the thing being listed. This is an array in the format `[ "price", "<number>", "<currency>", "<frequency>" ]`.
   - `"price"` is the name of the tag
   - `"<number>"` is the amount in numeric format (but included in the tag as a string)
-  - `"<currency>"` is the currency unit in 3-character ISO 4217 format.
+  - `"<currency>"` is the currency unit in 3-character ISO 4217 format or ISO 4217-like currency code (e.g. 'btc', 'eth').
   - `"<frequency>"` is optional and can be used to describe recurring payments. SHOULD be in noun format (hour, day, week, month, year, etc.)
 
 #### `price` examples