diff --git a/book/src/error-errorkind.md b/book/src/error-errorkind.md
index 4440128..4f1cc4c 100644
--- a/book/src/error-errorkind.md
+++ b/book/src/error-errorkind.md
@@ -39,6 +39,10 @@ yourself:
 
 ```rust
 impl Fail for MyError {
+    fn name(&self) -> Option<&str> {
+        self.inner.name()
+    }
+
     fn cause(&self) -> Option<&Fail> {
         self.inner.cause()
     }
diff --git a/book/src/string-custom-error.md b/book/src/string-custom-error.md
index a567836..5ea7b8f 100644
--- a/book/src/string-custom-error.md
+++ b/book/src/string-custom-error.md
@@ -20,6 +20,10 @@ pub struct MyError {
 }
 
 impl Fail for MyError {
+    fn name(&self) -> Option<&str> {
+        self.inner.name()
+    }
+
     fn cause(&self) -> Option<&Fail> {
         self.inner.cause()
     }
@@ -105,6 +109,10 @@ pub struct MyError {
 }
 
 impl Fail for MyError {
+    fn name(&self) -> Option<&str> {
+        self.inner.name()
+    }
+
     fn cause(&self) -> Option<&Fail> {
         self.inner.cause()
     }