diff --git a/README.md b/README.md
index 52a2c3a..1104096 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,20 @@ Autotools project
 
 This is a template of an Autotools project.
 
+
+
+Table of contents
+-----------------
+
+* [Overview](#autotools-project)
+* [Table of contents](#table-of-contents)
+* [Usage](#usage)
+
+
+
+Usage
+-----
+
 Don't forget to change the following files:
 
 * `.gitignore`
diff --git a/configure.ac b/configure.ac
index 4823716..eadd294 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,14 +2,14 @@
 # Specify program versions #
 ############################
 
-AC_PREREQ([2.68])
+AC_PREREQ([2.70])
 LT_PREREQ([2.4.6])
 
 
 
-#######################
-# Initialize Autoconf #
-#######################
+##################################
+# Initialize Autoconf & Automake #
+##################################
 
 AC_INIT([autotools-project],
   m4_normalize(m4_include([VERSION])),
@@ -28,12 +28,6 @@ AC_CONFIG_FILES([
   include/Makefile
 ])
 
-
-
-#######################
-# Initialize Automake #
-#######################
-
 AM_INIT_AUTOMAKE([1.16 subdir-objects])
 
 
@@ -47,7 +41,6 @@ AC_LANG([C])
 AM_PROG_AR
 AM_PROG_AS
 AC_PROG_CC
-AC_PROG_CC_C99
 AC_C_INLINE
 AC_CHECK_HEADER_STDBOOL
 AC_CHECK_HEADERS([stdarg.h stddef.h stdint.h])