diff --git a/src/fees.ts b/src/fees.ts
index 69c0e6b..2cdc9b8 100644
--- a/src/fees.ts
+++ b/src/fees.ts
@@ -141,7 +141,7 @@ export function checkFeeRateError(feeRateSatsPerVbyte) {
  * Validate the given transaction fee rate (in Satoshis/vbyte). Returns an
  * error message if invalid. Returns empty string if valid.
  *
- * - Must be a parseable as a number.
+ * - Must be parseable as a number.
  *
  * - Cannot be negative (zero is OK).
  *