diff --git a/_data/categories.yml b/_data/categories.yml
index b19d6600..6d14617f 100644
--- a/_data/categories.yml
+++ b/_data/categories.yml
@@ -6,6 +6,7 @@
     - Contextual inquiry
     - Design studio
     - Dot voting
+    - Five whys
     - Heuristic evaluation
     - Hopes and fears
     - KJ method