diff --git a/rails5/en/api_on_rails.adoc b/rails5/en/api_on_rails.adoc
index d4480a8..fcf9262 100644
--- a/rails5/en/api_on_rails.adoc
+++ b/rails5/en/api_on_rails.adoc
@@ -36,7 +36,7 @@ include::chapter04-refactoring-tests.adoc[]
 
 <<<
 
-include::chapter05-athentification.adoc[]
+include::chapter05-authentication.adoc[]
 
 <<<
 
diff --git a/rails5/en/chapter05-authentication.adoc b/rails5/en/chapter05-authentication.adoc
index ba36b55..cd9f8e7 100644
--- a/rails5/en/chapter05-authentication.adoc
+++ b/rails5/en/chapter05-authentication.adoc
@@ -1,4 +1,4 @@
-[#chapter05-athentification]
+[#chapter05-authentication]
 = Authenticating users
 
 It's been a long way since you started. I hope you are enjoying this trip as much as me. On previous chapter we refactor our test suite and since we did not add much code. If you skipped that chapter I recommend you read it. As we are going to be using some of the methods in the chapters to come.
diff --git a/rails5/fr/api_on_rails.adoc b/rails5/fr/api_on_rails.adoc
index 1100a86..be88bd2 100644
--- a/rails5/fr/api_on_rails.adoc
+++ b/rails5/fr/api_on_rails.adoc
@@ -36,7 +36,7 @@ include::chapter04-refactoring-tests.adoc[]
 
 <<<
 
-include::chapter05-athentification.adoc[]
+include::chapter05-authentication.adoc[]
 
 <<<
 
diff --git a/rails5/fr/chapter05-authentication.adoc b/rails5/fr/chapter05-authentication.adoc
index c112bcf..78e9285 100644
--- a/rails5/fr/chapter05-authentication.adoc
+++ b/rails5/fr/chapter05-authentication.adoc
@@ -1,4 +1,4 @@
-[#chapter05-athentification]
+[#chapter05-authentication]
 = Authentification des utilisateurs
 
 Cela fait longtemps que vous avez commencé. J'espère que vous appréciez ce voyage autant que moi. Au chapitre 4, nous avons factorisé notre suite de tests et, comme nous n'avons pas ajouté beaucoup de code, cela n'a pas pris trop de temps. Si vous avez sauté ce chapitre, je vous recommande de le lire, car nous allons utiliser certaines méthodes dans les chapitres à venir.
diff --git a/rails6/en/api_on_rails.adoc b/rails6/en/api_on_rails.adoc
index 4c57673..04ba25c 100644
--- a/rails6/en/api_on_rails.adoc
+++ b/rails6/en/api_on_rails.adoc
@@ -32,7 +32,7 @@ include::chapter03-presenting-users.adoc[]
 
 <<<
 
-include::chapter04-athentification.adoc[]
+include::chapter04-authentication.adoc[]
 
 <<<
 
diff --git a/rails6/es/api_on_rails.adoc b/rails6/es/api_on_rails.adoc
index 25e5f5b..4728c3a 100644
--- a/rails6/es/api_on_rails.adoc
+++ b/rails6/es/api_on_rails.adoc
@@ -32,7 +32,7 @@ include::chapter03-presenting-users.adoc[]
 
 <<<
 
-include::chapter04-athentification.adoc[]
+include::chapter04-authentication.adoc[]
 
 <<<
 
diff --git a/rails6/es/chapter04-authentication.adoc b/rails6/es/chapter04-authentication.adoc
index 94b172f..9306ffe 100644
--- a/rails6/es/chapter04-authentication.adoc
+++ b/rails6/es/chapter04-authentication.adoc
@@ -1,4 +1,4 @@
-[#chapter05-athentification]
+[#chapter05-authentication]
 = Autenticando al usuario
 
 Ha sido un largo tiempo desde que iniciamos. Espero que te guste este viaje tanto como a mí.
diff --git a/rails6/fr/api_on_rails.adoc b/rails6/fr/api_on_rails.adoc
index e4663a5..c39a00a 100644
--- a/rails6/fr/api_on_rails.adoc
+++ b/rails6/fr/api_on_rails.adoc
@@ -32,7 +32,7 @@ include::chapter03-presenting-users.adoc[]
 
 <<<
 
-include::chapter04-athentification.adoc[]
+include::chapter04-authentication.adoc[]
 
 <<<
 
diff --git a/rails6/fr/chapter04-authentication.adoc b/rails6/fr/chapter04-authentication.adoc
index f125abb..00b2a05 100644
--- a/rails6/fr/chapter04-authentication.adoc
+++ b/rails6/fr/chapter04-authentication.adoc
@@ -1,4 +1,4 @@
-[#chapter04-athentification]
+[#chapter04-authentication]
 = Authentification des utilisateurs
 
 Cela fait longtemps que vous avez commencé. J'espère que vous appréciez ce voyage autant que moi.