diff --git a/reference/users/youwen/config/harper-ls/dictionary.txt b/reference/users/youwen/config/harper-ls/dictionary.txt
index 940fe14..1066aef 100644
--- a/reference/users/youwen/config/harper-ls/dictionary.txt
+++ b/reference/users/youwen/config/harper-ls/dictionary.txt
@@ -18,5 +18,7 @@ transpiles
 Gradescope
 bijections
 disjunction
+denumerable
 biconditional
 hyperextensible
+diagonalization