diff --git a/src/lib.rs b/src/lib.rs
index 6057d81..49ad7a9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -493,7 +493,6 @@
 //!             request.utf8_lossy_body().unwrap().contains("hello")
 //!     })
 //!     .create();
-//!
 //! ```
 //!
 //! # Asserts
@@ -673,7 +672,7 @@
 //!
 //! # Non-matching calls
 //!
-//! Any calls to the Mockito server that are not matched will return *501 Mock Not Found*.
+//! Any calls to the Mockito server that are not matched will return *501 Not Implemented*.
 //!
 //! Note that **mocks are matched in reverse order** - the most recent one wins.
 //!
diff --git a/src/mock.rs b/src/mock.rs
index fafab9c..95ea323 100644
--- a/src/mock.rs
+++ b/src/mock.rs
@@ -388,7 +388,7 @@ impl Mock {
     /// ```
     /// let mut s = mockito::Server::new();
     ///
-    /// let _m = s.mock("GET", mockito::Matcher::Any).with_header_from_request("user", |request| {
+    /// let _m = s.mock("GET", mockito::Matcher::Any).with_header_from_request("x-user", |request| {
     ///     if request.path() == "/bob" {
     ///         "bob".into()
     ///     } else if request.path() == "/alice" {
diff --git a/tests/lib.rs b/tests/lib.rs
index 4ce3b78..66601a0 100644
--- a/tests/lib.rs
+++ b/tests/lib.rs
@@ -681,7 +681,7 @@ fn test_mock_with_header() {
 fn test_mock_with_header_from_request() {
     let mut s = Server::new();
     s.mock("GET", Matcher::Any)
-        .with_header_from_request("user", |req| {
+        .with_header_from_request("x-user", |req| {
             if req.path() == "/alice" {
                 "alice".into()
             } else {
@@ -691,9 +691,9 @@ fn test_mock_with_header_from_request() {
         .create();
 
     let (_, headers, _) = request(s.host_with_port(), "GET /alice", "");
-    assert!(headers.contains(&"user: alice".to_string()));
+    assert!(headers.contains(&"x-user: alice".to_string()));
     let (_, headers, _) = request(s.host_with_port(), "GET /anyone-else", "");
-    assert!(headers.contains(&"user: everyone".to_string()));
+    assert!(headers.contains(&"x-user: everyone".to_string()));
 }
 
 #[test]