code: public Object put(final String key, final Object value) {
  		return additionalData.put(key, value);
  	}
docs: Puts a key/value pair to the internal map of additional meta data.
  
  @param key
  the key
  @param value
  the value
  @return the previous value, or null
  @see java.util.Map#put(java.lang.Object, java.lang.Object)