added contact info and acknowledgements

preface.asciidoc

@@ -143,6 +143,26 @@ Andreas would also like to thank all of the patrons who support his work through
 link:$$https://patreon.com/aantonop$$[].
 
 
+==== Contacting Rene
+
+You can contact Rene Pickhardt on his personal site:
+link:$$https://www.rene-pickhardt.de/$$[]
+
+Subscribe to Rene's channel on YouTube:
+link:$$https://www.youtube.com/user/RenePickhardt$$[]
+
+Follow Rene on Twitter:
+link:$$https://twitter.com/renepickhardt$$[]
+
+Connect with Rene on LinkedIn:
+link:$$https://www.linkedin.com/in/rene-pickhardt-80313744/$$[]
+
+Rene would also like to thank all of the patrons who support his work through monthly donations. You can support Rene on Patreon at
+link:$$https://patreon.com/renepickhardt$$[].
+
+Or you can support his work directly with bitcoin (also via the Lightning network) at link:$$https://tallyco.in/s/lnbook$$[] for which Rene is equally thankful as for his patreons.
+
+
 [[acknowledgments_sec]]
 === Acknowledgments by Andreas
 
@@ -150,6 +170,10 @@ I owe my love of words and books to my mother, Theresa, who raised me in a house
 
 Thank you all for supporting me throughout this journey.
 
+=== Acknowledgments by Rene
+
+I want to mainly thank all the students I ever tought and who engaged into interesting discussions and questions. Believe it or not from you I learnt the most. I am also gratefull to the Bitcoin and Lightning Network community who wellcomed me and supported my efforts. In particular I am grateful to all the open source bitcoin and lightning network protocol developers and people who fund them to make that technology possible. Last but not least I am thankfull to my loved ones.
+
 [[github_contrib]]
 === Contributions