code: func (c *ConfigFile) GetKeyComments(section, key string) (comments string) {
  	// Blank section name represents DEFAULT section.
  	if len(section) == 0 {
  		section = DEFAULT_SECTION
  	}
  
  	if _, ok := c.keyComments[section]; ok {
  		return c.keyComments[section][key]
  	}
  	return ""
  }
docs: // GetKeyComments returns the comments of key in the given section.
  // It returns an empty string(0 length) if the comments do not exist.