--- a/runtime/spell/main.aap
+++ b/runtime/spell/main.aap
@@ -1,10 +1,22 @@
-# "aap": generate all the .spl files
-# "aap diff" create all the diff files
+# Toplevel Aap recipe for Vim spell files
+#
+# Usage:
+# aap        generate all the .spl files
+# aap diff   create all the diff files
 
-LANG = af bg ca cs da de en fr he hr it nl ny pl sk yi
+LANG = af bg ca cs da de el en eo fr fo gl he hr it nl ny pl sk yi
+
+# TODO:
+# Finnish doesn't work, the dictionary fi_FI.zip file contains hyphenation...
 
 diff: $*LANG/diff
         :print done
 
 @for l in string.split(_no.LANG):
         :child $l/main.aap
+
+# The existing .spl files need to be generated when the spell file format
+# changes.  Depending on the Vim executable does that, but results in doing it
+# much too often.  Generate a dummy .spl file and check if it changed.
+:child check/main.aap
+*.spl: check/check.latin1.spl