diff --git a/logseq/graphs-txid.edn b/logseq/graphs-txid.edn
index d56e614..3a2ce6e 100644
--- a/logseq/graphs-txid.edn
+++ b/logseq/graphs-txid.edn
@@ -1 +1 @@
-["6819d5ac-7c6b-4965-ba7b-e56686e61416" "e11b5282-195e-40cb-af42-af79882dc719" 534]
\ No newline at end of file
+["6819d5ac-7c6b-4965-ba7b-e56686e61416" "e11b5282-195e-40cb-af42-af79882dc719" 536]
\ No newline at end of file
diff --git a/logseq/version-files/base/pages/zettlekasten.md b/logseq/version-files/base/pages/zettlekasten.md
index 63f0541..2fce48e 100644
--- a/logseq/version-files/base/pages/zettlekasten.md
+++ b/logseq/version-files/base/pages/zettlekasten.md
@@ -2,7 +2,7 @@ tags:: #meta #seed
 
 - **prev:** [[personal knowledge management]]
 - zettlekasten is a german word meaning "slip box".
-- zettlekasten is a note taking system. it was popularized by sonkhe ahrens
+- zettlekasten is a note taking system. it was popularized by [sonkhe ahrens' "how to take smart notes"](https://www.soenkeahrens.de/en/takesmartnotes) by documenting the way that [niklas luhmann](https://en.wikipedia.org/wiki/Niklas_Luhmann)
 - the original zettlekastens were card files consisting of small pieces of information stored on note cards kept in card filing cabinets.
 	- these small pieces of information are called [[zettles]].
 	- [[zettles]] are usually linked together to create a mental network of information.
diff --git a/pages/zettlekasten.md b/pages/zettlekasten.md
index 4bf0476..9911223 100644
--- a/pages/zettlekasten.md
+++ b/pages/zettlekasten.md
@@ -2,7 +2,7 @@ tags:: #meta #seed
 
 - **prev:** [[personal knowledge management]]
 - zettlekasten is a german word meaning "slip box".
-- zettlekasten is a note taking system. it was popularized by sonkhe ahrens by documenting the way that []
+- zettlekasten is a note taking system. it was popularized by [sonkhe ahrens' "how to take smart notes"](https://www.soenkeahrens.de/en/takesmartnotes) by documenting the way that [niklas luhmann](https://en.wikipedia.org/wiki/Niklas_Luhmann) was able to use
 - the original zettlekastens were card files consisting of small pieces of information stored on note cards kept in card filing cabinets.
 	- these small pieces of information are called [[zettles]].
 	- [[zettles]] are usually linked together to create a mental network of information.