diff --git a/free-programming-books-es.md b/free-programming-books-es.md
index ba99f46397fbfb5959a752a38b361fe64f2740f8..a762b7bf9a272dd00d5c967fd626a4bbbf703636 100644
--- a/free-programming-books-es.md
+++ b/free-programming-books-es.md
@@ -1,7 +1,7 @@
 ### Index
 
-* [0 - Metalistas](#0-metalistas)
-* [1 - Agnósticos](#1-agn%C3%B3sticos)
+* [0 - Metalistas](#0---metalistas)
+* [1 - Agnósticos](#1---agn%C3%B3sticos)
   * [Algoritmos y Estructuras de Datos](#algoritmos)
   * [Base de Datos](#base-de-datos)
   * [Ciencia Computacional](#ciencia-computacional)
diff --git a/free-programming-books-fr.md b/free-programming-books-fr.md
index 51addf46146cf4535b1c6ee3996fe8d588ec200c..04c2be5f20439a39e1cdd7b3e9de00d2c114c048 100644
--- a/free-programming-books-fr.md
+++ b/free-programming-books-fr.md
@@ -1,7 +1,7 @@
 ### Index
 
-* [0 - Méta-listes](#0-méta-listes)
-* [1 - Non dépendant du langage](#1-non-dépendant-du-langage)
+* [0 - Méta-listes](#0---méta-listes)
+* [1 - Non dépendant du langage](#1---non-dépendant-du-langage)
   * [Algorithmique](#algorithmique)
   * [Logiciels libres](#logiciels-libres)
   * [Makefile](#makefile)
diff --git a/free-programming-books-hu.md b/free-programming-books-hu.md
index a210ea6a47d3718d045f0771a6dda89e14f696f9..c2c4299055c68a1a0c0e5ab16139c91932c6cb39 100644
--- a/free-programming-books-hu.md
+++ b/free-programming-books-hu.md
@@ -1,6 +1,6 @@
 ### Index
 
-* [0 - Programozási nyelv független](#0-programozasi-nyelv-fuggetlen)
+* [0 - Programozási nyelv független](#0---programozasi-nyelv-fuggetlen)
 * [Ada](#ada)
 * [Arduino](#arduino)
 * [C++](#c)
diff --git a/free-programming-books-it.md b/free-programming-books-it.md
index 1b45a6035de37dbe60e61e14ed669c0059080012..daa3c71798af599dec9b94adecb45a2a9842ddba 100644
--- a/free-programming-books-it.md
+++ b/free-programming-books-it.md
@@ -1,6 +1,6 @@
 ### Index
 
-* [0 - Agnostico](#0-agnostico)
+* [0 - Agnostico](#0---agnostico)
   * [Algoritmi e Strutture Dati](#algoritmi-e-strutture-dati)
   * [Metodologie di sviluppo del software](#metodologie-di-sviluppo-del-software)
 * [Android](#android)
diff --git a/free-programming-books-ja.md b/free-programming-books-ja.md
index c05e72068502cddce5cbaf636223f5c50dcc4076..ec8565f473d98d41643e7823253dbcee31106acb 100644
--- a/free-programming-books-ja.md
+++ b/free-programming-books-ja.md
@@ -1,6 +1,6 @@
 ### Index
 
-* [0 - 言語非依存](#0-%e8%a8%80%e8%aa%9e%e9%9d%9e%e4%be%9d%e5%ad%98)
+* [0 - 言語非依存](#0---%e8%a8%80%e8%aa%9e%e9%9d%9e%e4%be%9d%e5%ad%98)
   * [アクセシビリティ](#%e3%82%a2%e3%82%af%e3%82%bb%e3%82%b7%e3%83%93%e3%83%aa%e3%83%86%e3%82%a3)
   * [グラフィックスプログラミング](#%e3%82%b0%e3%83%a9%e3%83%95%e3%82%a3%e3%83%83%e3%82%af%e3%82%b9%e3%83%97%e3%83%ad%e3%82%b0%e3%83%a9%e3%83%9f%e3%83%b3%e3%82%b0)
   * [グラフィックユーザーインターフェイス](#%e3%82%b0%e3%83%a9%e3%83%95%e3%82%a3%e3%83%83%e3%82%af%e3%83%a6%e3%83%bc%e3%82%b6%e3%83%bc%e3%82%a4%e3%83%b3%e3%82%bf%e3%83%bc%e3%83%95%e3%82%a7%e3%82%a4%e3%82%b9)
diff --git a/free-programming-books-pl.md b/free-programming-books-pl.md
index 69c5a81557131b07a90e2b867aea4db30c48929d..f500c115cd476cef463f9c6fbc72bcad93592331 100644
--- a/free-programming-books-pl.md
+++ b/free-programming-books-pl.md
@@ -1,6 +1,6 @@
 ### Index
 
-* [0 - Niezależne od języka programowania](#0-niezale%C5%BCne-od-j%C4%99zyka-programowania)
+* [0 - Niezależne od języka programowania](#0---niezale%C5%BCne-od-j%C4%99zyka-programowania)
 * [Android](#android)
 * [C](#c)
 * [C++](#c-1)