diff --git a/week04/ex3.sh b/week04/ex3.sh
index 3e1e9d7..d0abfbd 100755
--- a/week04/ex3.sh
+++ b/week04/ex3.sh
@@ -7,7 +7,7 @@ sleep 1
 i=0
 while [ $i -lt 3 ]
 do
-    pstree
+    pstree $$
     sleep 5
     i=$(( i + 1 ))
 done
@@ -18,7 +18,7 @@ sleep 1
 i=0
 while [ $i -lt 5 ]
 do
-    pstree
+    pstree $$
     sleep 5
     i=$(( i + 1 ))
 done