diff --git a/src/array.c b/src/array.c
index c09ab80..7ddfcf9 100644
--- a/src/array.c
+++ b/src/array.c
@@ -16,11 +16,20 @@
 #include <string.h>
 #include "array.h"
 
+/**
+ * Create a String Array by initializing its structure.
+ * @param string_array The String Array to create.
+ */
 void create_string_array(StringArray *string_array) {
     string_array->array = NULL;
     string_array->size = 0;
 }
 
+/**
+ * Insert a string into the String Array.
+ * @param string_array The String Array to insert into.
+ * @param string The string to insert into the String Array.
+ */
 void insert_string_array(StringArray *string_array, char *string) {
     if (string_array->size == 0) {
         string_array->array = malloc(sizeof(char *));
@@ -33,6 +42,11 @@ void insert_string_array(StringArray *string_array, char *string) {
     string_array->size++;
 }
 
+/**
+ * Delete a string from the String Array.
+ * @param string_array The String Array to delete from.
+ * @param index The index in the String Array to delete.
+ */
 void delete_string_array(StringArray *string_array, int index) {
     if (string_array->size > 0 && string_array->size > index) {
         for (int i = index; i < string_array->size - 1; i++) {
@@ -48,6 +62,10 @@ void delete_string_array(StringArray *string_array, int index) {
     }
 }
 
+/**
+ * Free the String Array and all of its strings.
+ * @param string_array The String Array to free.
+ */
 void free_string_array(StringArray *string_array) {
     for (int i = 0; i < string_array->size; i++) {
         free(string_array->array[i]);
diff --git a/src/builtins.c b/src/builtins.c
index 4648ad9..bb70815 100644
--- a/src/builtins.c
+++ b/src/builtins.c
@@ -18,6 +18,11 @@
 #include "array.h"
 #include "builtins.h"
 
+/**
+ * Check if the command is a builtin or not.
+ * @param command String with the command name to check.
+ * @return Returns true if it's a builtin or false otherwise.
+ */
 bool is_builtin(char *command) {
     if (strcmp(command, "exit") == 0) {
         return true;
@@ -30,12 +35,20 @@ bool is_builtin(char *command) {
     return false;
 }
 
+/**
+ * Run the builtin command.
+ * @param string_array An array of strings containing the arguments to run.
+ */
 void run_builtin(StringArray *string_array) {
     if (strcmp(string_array->array[0], "exit") == 0) {
         exit_shell(string_array);
     }
 }
 
+/**
+ * Exit the shell.
+ * @param string_array The arguments that were used to call exit. This is used to free the memory before exit.
+ */
 void exit_shell(StringArray *string_array) {
     free_string_array(string_array);
     exit(EXIT_SUCCESS);
diff --git a/src/console_line.c b/src/console_line.c
index 99bfce2..58105e9 100644
--- a/src/console_line.c
+++ b/src/console_line.c
@@ -59,6 +59,10 @@ void print_input_line() {
     free(cwd);
 }
 
+/**
+ * Get input from the console.
+ * @return Returns a string input by the user.
+ */
 char *get_console_input() {
     size_t buffer_size = 0;
     char *line = NULL;