1 files changed, 1 insertions, 0 deletions
diff --git a/apl9.h b/apl9.h
index ef1785b..d7cb4e1 100644
--- a/apl9.h
+++ b/apl9.h
@@ -343,6 +343,7 @@ Array *fnNand(Array *, Array *);
 Array *fnNor(Array *, Array *);
 Array *fnTake(Array *, Array *);
 Array *fnIndex(Array *, Array *);
+Array *fnIndexOf(Array *, Array *);
 Array *fnMembership(Array *, Array *);
 Array *fnUnion(Array *, Array *);
 Array *fnExcluding(Array *, Array *);