diff --git a/bin/dbmigrate.php b/bin/dbmigrate.php
--- a/bin/dbmigrate.php
+++ b/bin/dbmigrate.php
@@ -1,40 +1,65 @@
 <?php
+/**
+ * DB Migrate script
+ *
+ * Export source database as SQL file
+ * Backup destination database as SQL file
+ * Import source export into destination database
+ * Replace values in destination database
+ *
+ * DB Migrate: Makes DTAP for Wordpress projects easy!
+ */
 
-$base_dir = realpath(__DIR__ . DIRECTORY_SEPARATOR . '..' . DIRECTORY_SEPARATOR . '..');
+// get the project root directory
+$base_dir = realpath(__DIR__ . DIRECTORY_SEPARATOR . '..' . DIRECTORY_SEPARATOR . '..' . DIRECTORY_SEPARATOR . '..' . DIRECTORY_SEPARATOR . '..');
+
+// get the config file
 $config_file = $base_dir . DIRECTORY_SEPARATOR . 'config' . DIRECTORY_SEPARATOR . 'dbmigrate' . DIRECTORY_SEPARATOR . 'env.ini';
-
+if (file_exists($config_file) === false)
+    exit('Config file does not exists. ' . $config_file);
 $config = parse_ini_file($config_file, true);
 $envs = array();
 foreach ($config as $name => $section)
 {
     if (substr($name, 0, strlen('env_')) === 'env_')
-    {
         $envs[substr($name, strlen('env_'))] = $section;
-    }
 }
 
-echo 'Available environments:' . PHP_EOL;
+// check if config is valid
+if (count($envs) < 2)
+    exit('Define at leaste 2 environments in the config!');
+
+// list envs
+echo 'Available environments: ' . PHP_EOL;
 foreach ($envs as $name => $env_config)
     echo '* ' . $name . PHP_EOL;
 echo PHP_EOL;
 
-echo 'Select the source env:' . PHP_EOL;
+// ask source env
+echo 'Select the source env: ';
 $source = trim(fgets(STDIN));
 echo PHP_EOL;
 
-echo 'Select the destination env:' . PHP_EOL;
+// ask dest env
+echo 'Select the destination env: ';
 $dest = trim(fgets(STDIN));
 echo PHP_EOL;
 
-echo 'Please make sure: You want to export the ' . $source . ' database to ' . $dest . '? Y|N' . PHP_EOL;
+// ask confirmation
+echo 'Please make sure:' . PHP_EOL . 'You want to export the ' . $source . ' database to the ' . $dest . ' database, all data in ' . $dest . ' will be removed! [Y|N]? ';
 $confirm = strtolower(trim(fgets(STDIN)));
 echo PHP_EOL;
 if (in_array($confirm, array('y', 'yes', 'j', 'ja', 'ok')) === false)
     exit('Okay, exit!');
 
+// create backup directory
 if (file_exists($base_dir . DIRECTORY_SEPARATOR . 'backup') === false)
+{
+    echo 'Creating backup directory ' . $base_dir . DIRECTORY_SEPARATOR . 'backup';
     mkdir($base_dir . DIRECTORY_SEPARATOR . 'backup');
+}
 
+// dump source and save path
 echo 'Dump source database:' . PHP_EOL;
 $source_dump = $file = $base_dir . DIRECTORY_SEPARATOR . 'backup' . DIRECTORY_SEPARATOR . 'dbbackup_' . $source . '_' . date('YmdHis') . '.sql';
 $command = 'mysqldump --add-drop-table --comments --host=' . $envs[$source]['host'] . ' --no-create-db --password=' . $envs[$source]['password'] . ' --port=' . $envs[$source]['port'] . ' --result-file=' . $file . ' --default-character-set=utf8 --user=' . $envs[$source]['user'] . ' ' . $envs[$source]['name'];
@@ -43,6 +68,7 @@ echo '  command: ' . $command . PHP_EOL;
 system($command);
 echo PHP_EOL . 'Complete' . PHP_EOL . PHP_EOL;
 
+// dump dest and save path
 echo 'Dump source database:' . PHP_EOL;
 $dest_dump = $file = $base_dir . DIRECTORY_SEPARATOR . 'backup' . DIRECTORY_SEPARATOR . 'dbbackup_' . $dest . '_' . date('YmdHis') . '.sql';
 $command = 'mysqldump --add-drop-table --comments --host=' . $envs[$dest]['host'] . ' --no-create-db --password=' . $envs[$dest]['password'] . ' --port=' . $envs[$dest]['port'] . ' --result-file=' . $file . ' --default-character-set=utf8 --user=' . $envs[$dest]['user'] . ' ' . $envs[$dest]['name'];
@@ -51,6 +77,7 @@ echo '  command: ' . $command . PHP_EOL;
 system($command);
 echo PHP_EOL . 'Complete' . PHP_EOL . PHP_EOL;
 
+// load data
 echo 'Load data on destination database:' . PHP_EOL;
 $command = 'mysql --host=' . $envs[$dest]['host'] . ' --password=' . $envs[$dest]['password'] . ' --port=' . $envs[$dest]['port'] . ' --default-character-set=utf8 --user=' . $envs[$dest]['user'] . ' --database=' . $envs[$dest]['name'] . ' < ' . $source_dump;
 echo '  load sql: ' . $source_dump . PHP_EOL;
@@ -58,6 +85,7 @@ echo '  command: ' . $command . PHP_EOL;
 system($command);
 echo PHP_EOL . 'Complete' . PHP_EOL . PHP_EOL;
 
+// run dvdgiessen dbsr
 echo 'Replace domain information in database:' . PHP_EOL;
 $command = 'php vendor\dvdgiessen\dbsr\index.php --host ' . $envs[$dest]['host'] . ' --user ' . $envs[$dest]['user'] . ' --password ' . $envs[$dest]['password'] . ' --database ' . $envs[$dest]['name'] . ' --charset utf8 -- ' . $envs[$source]['domain'] . ' ' . $envs[$dest]['domain'];
 echo '  search for:   ' . $envs[$source]['domain'] . PHP_EOL;
@@ -66,4 +94,6 @@ echo '  command: ' . $command . PHP_EOL;
 system($command);
 echo PHP_EOL . 'Complete' . PHP_EOL . PHP_EOL;
 
+// info user
+echo 'A copy of the old database of ' .  $dest . ' is saved in ' . $dest_dump . PHP_EOL;
 echo PHP_EOL . 'Done!' . PHP_EOL . PHP_EOL;
\ No newline at end of file