sS addFunctionNameToInclude(S snippetID, S functionName) {
  LS tok = javaTokSnippet(snippetID);
  var pif = tok_nextPleaseIncludeFunctionsStatement(tok);
  if (pif == null) ret "PIF statement not found in snippet";
  
  if (pif.containsFunction(functionName)) ret functionName + " already included";
  
  int i = pif.iFirstIdentifier;
  tokPrepend(tok, i, functionName + or2(javaDropComments(tok.get(i+1)), " "));
  
  ret editSnippet(snippetID, join(tok));
}