diff --git a/packages/interval/README.md b/packages/interval/README.md
index 7b251c33..8c4f5df3 100644
--- a/packages/interval/README.md
+++ b/packages/interval/README.md
@@ -81,7 +81,7 @@ Interval.simplify("9M"); // => "2M"
 Interval.simplify("2M"); // => "2M"
 Interval.simplify("-2M"); // => "7m"
 ["8P", "9M", "10M", "11P", "12P", "13M", "14M", "15P"].map(Interval.simplify);
-// => [ "8P", "2M", "3M", "4P", "5P", "6M", "7M", "8P" ]
+// => [ "8P", "2M", "3M", "4P", "5P", "6M", "7M", "1P" ]
 ```
 
 #### `invert(interval: string) => string`
diff --git a/packages/interval/index.ts b/packages/interval/index.ts
index be7a8152..72933c5d 100644
--- a/packages/interval/index.ts
+++ b/packages/interval/index.ts
@@ -69,7 +69,7 @@ export const num = (name: string) => props(name).num;
  * Interval.simplify("2M") // => "2M"
  * Interval.simplify("-2M") // => "7m"
  * ["8P", "9M", "10M", "11P", "12P", "13M", "14M", "15P"].map(Interval.simplify)
- * // => [ "8P", "2M", "3M", "4P", "5P", "6M", "7M", "8P" ]
+ * // => [ "8P", "2M", "3M", "4P", "5P", "6M", "7M", "1P" ]
  */
 export function simplify(name: IntervalName): IntervalName {
   const i = props(name);