diff --git a/NEWS.md b/NEWS.md
index daf57fd4..9c3d87f5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,9 @@
 # cargo-mutants changelog
 
+## Unreleased
+
+- Generate `HttpResponse::Ok().finish()` as a mutation of an Actix `HttpResponse`.
+
 ## 23.6.0
 
 - Generate `Box::leak(Box::new(...))` as a mutation of functions returning
diff --git a/book/src/mutants.md b/book/src/mutants.md
index 7fac9d3e..ada5cfce 100644
--- a/book/src/mutants.md
+++ b/book/src/mutants.md
@@ -32,6 +32,7 @@ More mutation genres and patterns will be added in future releases.
 | `Arc<T>`          | `Arc::new(...)`                                            |
 | `[T; L]`          | `[r; L]` for all replacements of T                         |
 | `&T`              | `&...` (all replacements for T)                            |
+| `HttpResponse`    | `HttpResponse::Ok().finish`                                |
 | (any other)       | `Default::default()`                                       |
 
 `...` in the mutation patterns indicates that the type is recursively mutated.