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 (tok.containsFunction(functionName)) ret functionName + " already included";
  
  int i = tok.iFirstIdentifier;
  tokPrepend(tok, i, functionName + or2(tok.get(i+1), " "));
  
  ret editSnippet(snippetID, join(tok));
}