diff --git a/archive/opinions.md b/archive/opinions.md
index e21215d..ba87e1d 100644
--- a/archive/opinions.md
+++ b/archive/opinions.md
@@ -1,5 +1,6 @@
 ---
 layout: archive
 lang: es
+which_category: opinions
 title: Publicaciones de opiniones
 ---