diff --git a/Sheet5/Ex5_Second_Attempt/main.cpp b/Sheet5/Ex5_Second_Attempt/main.cpp
index 4162e91..ad540da 100644
--- a/Sheet5/Ex5_Second_Attempt/main.cpp
+++ b/Sheet5/Ex5_Second_Attempt/main.cpp
@@ -1,4 +1,23 @@
 // Exercise 5 – Parallelization of Exercise 3
+//HOW TO RUN IT ON MY MAC: 
+//cd ~/Desktop/jacobi_oo_stl/jacobi_oo_stl
+//export CPPFLAGS="-I/opt/homebrew/opt/libomp/include"
+//export LDFLAGS="-L/opt/homebrew/opt/libomp/lib"
+//export PATH="/opt/homebrew/opt/llvm/bin:$PATH" 
+
+//clang++ -std=c++17 -O3 \
+-Xpreprocessor -fopenmp \
+$CPPFLAGS \
+main.cpp \
+jacsolve.cpp \
+getmatrix.cpp \
+geom.cpp \
+vdop.cpp \
+userset.cpp \
+$LDFLAGS -lomp \
+-o Ex5
+
+//./Ex5
 
 #include "geom.h"
 #include "getmatrix.h" //in here it is defined the parallel function