diff --git a/shell/hush.c b/shell/hush.c
index 0bddc9213..b46a1fd76 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -38,7 +38,6 @@
  *
  * POSIX syntax not implemented:
  *      aliases
- *      Arithmetic Expansion
  *      <(list) and >(list) Process Substitution
  *      Here Documents ( << word )
  *      Functions