diff --git a/earthly/cddl/Earthfile b/earthly/cddl/Earthfile
index 73bff5f2..9628d3c0 100644
--- a/earthly/cddl/Earthfile
+++ b/earthly/cddl/Earthfile
@@ -1,5 +1,7 @@
 VERSION 0.8
 
+# cspell: words cddlc
+
 cddl-base:
     FROM ruby:3.3.0-alpine