2 files changed, 8 insertions, 1 deletions
diff --git a/apl9.h b/apl9.h
index de7519f..8be337c 100644
--- a/apl9.h
+++ b/apl9.h
@@ -286,6 +286,7 @@ Array *fnNand(Array *, Array *);
 Array *fnNor(Array *, Array *);
 Array *fnTake(Array *, Array *);
 Array *fnIndex(Array *, Array *);
+Array *fnCatenateLast(Array *, Array *);
 Array *fnCatenateFirst(Array *, Array *);
 Array *fnReshape(Array *, Array *);
 
diff --git a/functions.c b/functions.c
index f2b0d83..09e4917 100644
--- a/functions.c
+++ b/functions.c
@@ -106,7 +106,7 @@ fndyad dyadfunctiondefs[] = {
 	0, /* ∪ */
 	0, /* ∩ */
 	0, /* ~ */
-	0, /* , */
+	fnCatenateLast, /* , */
 	fnCatenateFirst, /* ⍪ */
 	fnReshape, /* ⍴ */
 	0, /* ⌽ */
@@ -1034,6 +1034,12 @@ fnIndex(Array *left, Array *right)
 }
 
 Array *
+fnCatenateLast(Array *left, Array *right)
+{
+	return rundfn(L"⍉(⍉⍺)⍪⍉⍵", left, right);
+}
+
+Array *
 fnCatenateFirst(Array *left, Array *right)
 {
 	Array *leftarr = nil;