diff --git a/right-fit-swap-for-laptop-hibernation-Ubuntu-20.04-full-ZFS-install.md b/right-fit-swap-for-laptop-hibernation-Ubuntu-20.04-full-ZFS-install.md
index c67590b..e8f563d 100644
--- a/right-fit-swap-for-laptop-hibernation-Ubuntu-20.04-full-ZFS-install.md
+++ b/right-fit-swap-for-laptop-hibernation-Ubuntu-20.04-full-ZFS-install.md
@@ -1,11 +1,14 @@
 # right fit swap for laptop hibernation Ubuntu 20.04 full ZFS install
+## sources
+
+* [rephlex.de - How to hibernate and resume from swap file in Ubuntu 20.04 using full disk encryption](https://rephlex.de/blog/2019/12/27/how-to-hibernate-and-resume-from-swap-file-in-ubuntu-20-04-using-full-disk-encryption/)
+
 
 ## bios setup
 
 You have to disable secure boot in bios to permit Hibernate because of *kernel lockdown prevent hibernation* see links bellow :
 
-* [](https://unix.stackexchange.com/questions/591488/why-does-the-kernel-lockdown-prevent-hibernation)
-* [](https://rephlex.de/blog/2019/12/27/how-to-hibernate-and-resume-from-swap-file-in-ubuntu-20-04-using-full-disk-encryption/)
+* [stackexchange - Why does the kernel lockdown prevent hibernation?](https://unix.stackexchange.com/questions/591488/why-does-the-kernel-lockdown-prevent-hibernation)
 
 ## create swap partition to permit Hibernate