diff --git a/bookmarks.csv b/bookmarks.csv
index cb1cc1f..dbde117 100644
--- a/bookmarks.csv
+++ b/bookmarks.csv
@@ -69,4 +69,5 @@
 https://diataxis.fr/,Diataxis,"documentation,software engineering,programming"
 https://two-wrongs.com/debugging-common-lisp-in-slime.html,Debugging Common Lisp In Slime,"common lisp,debugging,slime"
 https://ccrma.stanford.edu/guides/package/emacs/emacs.html,Emacs Shortcuts / Key Bindings,"emacs,key bindings"
-https://lisper.in/reader-macros,Reader Macros In Common Lisp,"reader macros, common lisp"
\ No newline at end of file
+https://lisper.in/reader-macros,Reader Macros In Common Lisp,"reader macros, common lisp"
+http://lispm.de/docs/Publications/Common%20Lisp/CLOS%20and%20Efficiency/,CLOS articles,"common lisp, clos'
\ No newline at end of file