diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c915830..12b81e1d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,11 @@
 
 ## Features
 
+- Error [`props`](README.md#%EF%B8%8F-error-properties) now preserve
+  [property descriptors](https://github.com/ehmicky/redefine-property)
+- Error [`props`](README.md#%EF%B8%8F-error-properties) can be marked as
+  [non-enumerable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties)
+  by [prefixing their name](README.md#internal-error-properties) with `_`
 - [`plugin.properties()`](docs/plugins.md#properties) can now also return
   non-enumerable properties by prefixing their name with `_`
 
diff --git a/README.md b/README.md
index 01037775..472384cb 100644
--- a/README.md
+++ b/README.md
@@ -198,6 +198,25 @@ const error = new InputError('...', { props: { isUserError: true } })
 console.log(error.isUserError) // true
 ```
 
+### Internal error properties
+
+Error properties that are internal or secret can be prefixed with `_`. This
+makes them
+[non-enumerable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties),
+which prevents iterating or logging them.
+
+<!-- eslint-disable no-underscore-dangle -->
+
+```js
+const error = new InputError('...', {
+  props: { userId: 6, _isUserError: true },
+})
+console.log(error.userId) // 6
+console.log(error._isUserError) // true
+console.log(Object.keys(error)) // ['userId']
+console.log(error) // `userId` is logged, but not `_isUserError`
+```
+
 ## 🎀 Wrap errors
 
 ### Throw errors
diff --git a/docs/plugins.md b/docs/plugins.md
index 42ad32ac..a1c62bce 100644
--- a/docs/plugins.md
+++ b/docs/plugins.md
@@ -118,9 +118,10 @@ _Type_: `(info) => object`
 Set properties on `error.*` (including `message` or `stack`). The properties to
 set must be returned as an object.
 
-If a property's name starts with `_`, it is marked as
+Error properties that are internal or secret can be prefixed with `_`. This
+makes them
 [non-enumerable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties),
-i.e. it can neither be iterated nor logged.
+which prevents iterating or logging them.
 
 ```js
 export default {
diff --git a/types/plugins/shape.d.ts b/types/plugins/shape.d.ts
index e1f131ae..e06a79bc 100644
--- a/types/plugins/shape.d.ts
+++ b/types/plugins/shape.d.ts
@@ -178,6 +178,11 @@ export interface Plugin {
    * Set properties on `error.*` (including `message` or `stack`).
    * The properties to set must be returned as an object.
    *
+   * Error properties that are internal or secret can be prefixed with `_`.
+   * This makes them
+   * [non-enumerable](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Enumerability_and_ownership_of_properties),
+   * which prevents iterating or logging them.
+   *
    * @example
    * ```js
    * export default {