Help using custom fields

I use the following php to check if the Key I want to show even exists, then display the Value for the Key

<?php
      if (get_post_meta($post->ID, 'client', true)){  //If the Key 'client' exists...
            $key_description_value = get_post_meta($post->ID, 'client', true);  //...assign the variable $key_description_value the Value
            echo $key_description_value; //Print the Value to the screen
      }
?>