diff --git a/XPS-13-7390-2-in-1--.md b/XPS-13-7390-2-in-1--.md
index 62800aa..b119079 100644
--- a/XPS-13-7390-2-in-1--.md
+++ b/XPS-13-7390-2-in-1--.md
@@ -62,6 +62,13 @@ zfs change-key rpool
 
 ## create swap partition to permit Hibernate
 
+add theses 2 lines in 
+
+~~~
+MEMSIZE=$(cat /proc/meminfo | grep MemTotal | awk -F' ' '{print $2}')
+SWAPVOLSIZE=$(( MEMSIZE / 1024 ))
+~~~
+
 ~~~
 	# Convert to MiB to align the size on the size of a block
 	SWAPVOLSIZE=$(( SWAPSIZE / 1024 / 1024 ))