diff --git a/SysCall/README.md b/SysCall/README.md
index a5b0bb9..676cdd3 100644
--- a/SysCall/README.md
+++ b/SysCall/README.md
@@ -4,5 +4,5 @@ This chapter describes the `system call` concept in the linux kernel.
 
 * [Introduction to system call concept](http://0xax.gitbooks.io/linux-insides/content/SysCall/syscall-1.html) - this part is introduction to the `system call` concept in the Linux kernel.
 * [How the Linux kernel handles a system call](http://0xax.gitbooks.io/linux-insides/content/SysCall/syscall-2.html) - this part describes how the Linux kernel handles a system call from an userspace application.
-* [vsyscall and vDSO](http://0xax.gitbooks.io/linux-insides/content/SysCall/syscall-2.html) - third part describes `vsyscall` and `vDSO` concepts.
-* [How the Linux kernel runs a program](http://0xax.gitbooks.io/linux-insides/content/SysCall/syscall-3.html) - this part describes startup process of a program.
+* [vsyscall and vDSO](http://0xax.gitbooks.io/linux-insides/content/SysCall/syscall-3.html) - third part describes `vsyscall` and `vDSO` concepts.
+* [How the Linux kernel runs a program](http://0xax.gitbooks.io/linux-insides/content/SysCall/syscall-4.html) - this part describes startup process of a program.
diff --git a/SysCall/syscall-3.md b/SysCall/syscall-3.md
index b168c70..c01eb08 100644
--- a/SysCall/syscall-3.md
+++ b/SysCall/syscall-3.md
@@ -11,7 +11,7 @@ We already know what is a `system call`. This is special routine in the Linux ke
 Introduction to vsyscalls
 --------------------------------------------------------------------------------
 
-The `vsyscall` or `virtual system call` is the first and oldest mechinism in the Linux kernel that is designed to accelerate execution of certain system calls. The principle of work of the `vsyscall` concept is simple. The Linux kernel maps into user space a page that contains some variables and the implementation of some system calls. We can find information about this memory space in the Linux kernel [documentation](https://github.com/torvalds/linux/blob/master/Documentation/x86/x86_64/mm.txt) for the [x86_64](https://en.wikipedia.org/wiki/X86-64):
+The `vsyscall` or `virtual system call` is the first and oldest mechanism in the Linux kernel that is designed to accelerate execution of certain system calls. The principle of work of the `vsyscall` concept is simple. The Linux kernel maps into user space a page that contains some variables and the implementation of some system calls. We can find information about this memory space in the Linux kernel [documentation](https://github.com/torvalds/linux/blob/master/Documentation/x86/x86_64/mm.txt) for the [x86_64](https://en.wikipedia.org/wiki/X86-64):
 
 ```
 ffffffffff600000 - ffffffffffdfffff (=8 MB) vsyscalls