diff --git a/runtime/spell/main.aap b/runtime/spell/main.aap
index 34768b6..44d1990 100644
--- a/runtime/spell/main.aap
+++ b/runtime/spell/main.aap
@@ -1,7 +1,7 @@
 # "aap": generate all the .spl files
 # "aap diff" create all the diff files
 
-LANG = de en fr he it nl pl
+LANG = de en fr he it nl pl yi
 
 diff: $*LANG/diff
         :print done