diff --git a/content/programming.tree b/content/programming.tree
index a10f028..c4cfb00 100644
--- a/content/programming.tree
+++ b/content/programming.tree
@@ -17,7 +17,7 @@
 
     % content.link = "programming/blog/or-types"
       id = "01HTWN4XB2YMF3615BE8V6Y76A"
-    - OR-types
+    + OR-types
 
 % id = "01HRG2RJCNKT9JJJVQ8WVRC9CA"
 - ### languages