diff --git a/book/src/exit-codes.md b/book/src/exit-codes.md
index a0885cc4..70253924 100644
--- a/book/src/exit-codes.md
+++ b/book/src/exit-codes.md
@@ -8,7 +8,7 @@ cargo-mutants returns an exit code that can be used by scripts or CI.
 
 * **2**: Found some mutants that were not covered by tests.
 
-* **3**: Some tests timed out: possibly the mutatations caused an infinite loop,
+* **3**: Some tests timed out: possibly the mutations caused an infinite loop,
   or the timeout is too low.
 
 * **4**: The tests are already failing or hanging before any mutations are
diff --git a/testdata/well_tested/src/simple_fns.rs b/testdata/well_tested/src/simple_fns.rs
index 2b4d6f86..7a17fec2 100644
--- a/testdata/well_tested/src/simple_fns.rs
+++ b/testdata/well_tested/src/simple_fns.rs
@@ -46,7 +46,7 @@ mod tests {
     }
 
     #[test]
-    fn test_mutatable_functions() {
+    fn main_tests() {
         assert_eq!(returns_42u32(), 42);
 
         assert!(divisible_by_three(0));