diff --git a/doc/README.md b/doc/README.md
index 05db5c6f6..50f7c61c1 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -1725,7 +1725,7 @@ _.indexBy(keys, 'dir');
 _.indexBy(keys, function(key) { return String.fromCharCode(key.code); });
 // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
 
-_.indexBy(characters, function(key) { this.fromCharCode(key.code); }, String);
+_.indexBy(keys, function(key) { return this.fromCharCode(key.code); }, String);
 // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
 ```