diff --git a/Sheet5/gh_response.txt b/Sheet5/gh_response.txt
index d20576d..846e973 100644
--- a/Sheet5/gh_response.txt
+++ b/Sheet5/gh_response.txt
@@ -9,6 +9,9 @@ Linux: Using g++
 Using clang++
 > make run EX=Ex5 COMPILER=CLANG_
 
+Added 
+#include "algorithm"     // GH: transform()
+in mylib.pp:2
 
 1:
 no scheduling tested
diff --git a/Sheet5/mylib.cpp b/Sheet5/mylib.cpp
index 412d4a7..8124fcb 100644
--- a/Sheet5/mylib.cpp
+++ b/Sheet5/mylib.cpp
@@ -1,4 +1,5 @@
 #include "mylib.h"
+#include "algorithm"     // GH: transform()
 #include <cassert>       // assert()
 #include <cmath>
 #include <iostream>