1 files changed, 1 insertions, 0 deletions
diff --git a/apl9.h b/apl9.h
index 90cdda0..cad5ae4 100644
--- a/apl9.h
+++ b/apl9.h
@@ -352,6 +352,7 @@ Array *fnPick(Array *, Array *);
 Array *fnPartition(Array *, Array *);
 Array *fnIndex(Array *, Array *);
 Array *fnIndexOf(Array *, Array *);
+Array *fnIntervalIndex(Array *, Array *);
 Array *fnMembership(Array *, Array *);
 Array *fnUnion(Array *, Array *);
 Array *fnIntersection(Array *, Array *);