code: public final static PolymerNotation addAnnotationToPolymer(final PolymerNotation polymer, final String annotation) {
  		if (polymer.getAnnotation() != null) {
  			return new PolymerNotation(polymer.getPolymerID(), polymer.getPolymerElements(),
  					polymer.getAnnotation() + " | " + annotation);
  		}
  		return new PolymerNotation(polymer.getPolymerID(), polymer.getPolymerElements(), annotation);
  	}
docs: method to add an annotation to a PolymerNotation
  
  @param polymer
  PolymerNotation
  @param annotation
  new annotation
  @return PolymerNotation with the annotation