diff --git a/pkg/arvo/sys/arvo.hoon b/pkg/arvo/sys/arvo.hoon
index 7dbbb0a239..c308777ebc 100644
--- a/pkg/arvo/sys/arvo.hoon
+++ b/pkg/arvo/sys/arvo.hoon
@@ -415,7 +415,7 @@
     ==
   --
 ::
-::  |de: axal engine
+::  |of: axal engine
 ::
 ++  of
   =|  fat=(axal)