diff --git a/api/.gitignore b/api/.gitignore
index 674ab667..6651d7f1 100644
--- a/api/.gitignore
+++ b/api/.gitignore
@@ -3,6 +3,7 @@ docs/*.md
 
 # subsequent PRs will un-ignore areas that are under review until
 # all docs are complete and we can drop this ignore file entirely
+!docs/tough-cookie.parametererror.md
 !docs/tough-cookie.permutepath.md
 !docs/tough-cookie.version.md
 !docs/tough-cookie.parsedate.md
diff --git a/api/docs/tough-cookie.parametererror.md b/api/docs/tough-cookie.parametererror.md
new file mode 100644
index 00000000..12f3e01e
--- /dev/null
+++ b/api/docs/tough-cookie.parametererror.md
@@ -0,0 +1,15 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [tough-cookie](./tough-cookie.md) &gt; [ParameterError](./tough-cookie.parametererror.md)
+
+## ParameterError class
+
+Represents a validation error.
+
+**Signature:**
+
+```typescript
+export declare class ParameterError extends Error 
+```
+**Extends:** Error
+
diff --git a/api/tough-cookie.api.md b/api/tough-cookie.api.md
index 032dc9e1..77725730 100644
--- a/api/tough-cookie.api.md
+++ b/api/tough-cookie.api.md
@@ -263,7 +263,7 @@ export class MemoryCookieStore extends Store {
     updateCookie(oldCookie: Cookie, newCookie: Cookie, callback: ErrorCallback): void;
 }
 
-// @public (undocumented)
+// @public
 export class ParameterError extends Error {
 }
 
diff --git a/lib/validators.ts b/lib/validators.ts
index 64754973..ee98b9b8 100644
--- a/lib/validators.ts
+++ b/lib/validators.ts
@@ -83,4 +83,8 @@ export function validate(
   else throw err
 }
 
+/**
+ * Represents a validation error.
+ * @public
+ */
 export class ParameterError extends Error {}