diff --git a/lib/schema/bigint.js b/lib/schema/bigint.js
index 218b113690e..24cff4ea9ed 100644
--- a/lib/schema/bigint.js
+++ b/lib/schema/bigint.js
@@ -68,8 +68,8 @@ SchemaBigInt.set = SchemaType.set;
  * #### Example:
  *
  *     // Make Mongoose cast empty string '' to false.
- *     const original = mongoose.Schema.Boolean.cast();
- *     mongoose.Schema.Boolean.cast(v => {
+ *     const original = mongoose.Schema.BigInt.cast();
+ *     mongoose.Schema.BigInt.cast(v => {
  *       if (v === '') {
  *         return false;
  *       }
@@ -77,7 +77,7 @@ SchemaBigInt.set = SchemaType.set;
  *     });
  *
  *     // Or disable casting entirely
- *     mongoose.Schema.Boolean.cast(false);
+ *     mongoose.Schema.BigInt.cast(false);
  *
  * @param {Function} caster
  * @return {Function}