diff --git a/journal/2021-09-19.md b/journal/2021-09-19.md
index ee33f614c..ab6d1501c 100644
--- a/journal/2021-09-19.md
+++ b/journal/2021-09-19.md
@@ -4,6 +4,7 @@
   - had a great talk on Friday, I am thankful
   - [[moloch]]
 - [[loas a buda]]
+- [[max tegmark]]
 - [[ward cunningham]]
   - "Programming is the art and craft of reasoning about the future."
 - [[neil]] contributed a second FR! thank you kindly. he actually knows CSS (I hack it), which is amazing :)
diff --git a/max tegmark.md b/max tegmark.md
index 98e9254b7..46ddc6ad9 100644
--- a/max tegmark.md	
+++ b/max tegmark.md	
@@ -5,4 +5,5 @@
   - met him because of his podcast episode with [[sam harris]]
   - [[wp]] https://en.wikipedia.org/wiki/Max_Tegmark
     - [[go]] [[wp]]
+  - [[loved]] [[our mathematical universe]]
 
diff --git a/our mathematical universe.md b/our mathematical universe.md
index 3f3a9092d..4e6348397 100644
--- a/our mathematical universe.md	
+++ b/our mathematical universe.md	
@@ -5,4 +5,5 @@
   - [[wp]] https://en.wikipedia.org/wiki/Our_Mathematical_Universe
     - [[go]] [[wp]]
   - https://twitter.com/flancian/status/1426915098950504452
+  - one of my favourite books ever. listened to it as an audiobook.