diff --git a/HowtoWhois.md b/HowtoWhois.md
index 91028d20..d89eb858 100644
--- a/HowtoWhois.md
+++ b/HowtoWhois.md
@@ -1,5 +1,5 @@
 ---
-categories: XXX
+categories: net openbsd
 title: Howto whois
 ...