diff --git a/Chapter02/helloworld-params.c b/Chapter02/helloworld-params.c
index 1aeb62a..5def347 100644
--- a/Chapter02/helloworld-params.c
+++ b/Chapter02/helloworld-params.c
@@ -17,7 +17,7 @@ MODULE_PARM_DESC(mystr,"this is my char pointer variable");
 MODULE_PARM_DESC(myarr,"this is my array of int");
 MODULE_INFO(my_field_name, "What eeasy value");
 
-static int __init hellowolrd_init(void) {
+static int __init helloworld_init(void) {
     pr_info("Hello world with parameters!\n");
     pr_info("The *mystr* parameter: %s\n", mystr);
     pr_info("The *myint* parameter: %d\n", myint);
@@ -25,11 +25,11 @@ static int __init hellowolrd_init(void) {
     return 0;
 }
 
-static void __exit hellowolrd_exit(void) {
+static void __exit helloworld_exit(void) {
     pr_info("End of the world\n");
 }
 
-module_init(hellowolrd_init);
-module_exit(hellowolrd_exit);
+module_init(helloworld_init);
+module_exit(helloworld_exit);
 MODULE_AUTHOR("John Madieu <john.madieu@gmail.com>");
 MODULE_LICENSE("GPL");
diff --git a/Chapter02/helloworld.c b/Chapter02/helloworld.c
index 2b021a9..56fa23b 100644
--- a/Chapter02/helloworld.c
+++ b/Chapter02/helloworld.c
@@ -5,16 +5,16 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 
-static int __init hellowolrd_init(void) {
+static int __init helloworld_init(void) {
     pr_info("Hello world!\n");
     return 0;
 }
 
-static void __exit hellowolrd_exit(void) {
+static void __exit helloworld_exit(void) {
     pr_info("End of the world\n");
 }
 
-module_init(hellowolrd_init);
-module_exit(hellowolrd_exit);
+module_init(helloworld_init);
+module_exit(helloworld_exit);
 MODULE_AUTHOR("John Madieu <john.madieu@gmail.com>");
 MODULE_LICENSE("GPL");
diff --git a/Chapter16/gpio/gpio-legacy-module.c b/Chapter16/gpio/gpio-legacy-module.c
index 3b333a3..0f4ba63 100644
--- a/Chapter16/gpio/gpio-legacy-module.c
+++ b/Chapter16/gpio/gpio-legacy-module.c
@@ -26,7 +26,7 @@ static irqreturn_t btn1_pushed_irq_handler(int irq, void *dev_id)
     return IRQ_HANDLED;
 }
 
-static int __init hellowolrd_init(void)
+static int __init helloworld_init(void)
 {
     int retval;
 
@@ -72,7 +72,7 @@ static int __init hellowolrd_init(void)
     return 0;
 }
 
-static void __exit hellowolrd_exit(void)
+static void __exit helloworld_exit(void)
 {
     free_irq(irq, NULL);
     gpio_free(GPIO_LED_RED);
@@ -84,7 +84,7 @@ static void __exit hellowolrd_exit(void)
 }
 
 
-module_init(hellowolrd_init);
-module_exit(hellowolrd_exit);
+module_init(helloworld_init);
+module_exit(helloworld_exit);
 MODULE_AUTHOR("John Madieu <john.madieu@gmail.com>");
 MODULE_LICENSE("GPL");