diff --git a/xs.h b/xs.h
index f892472..ad8a35d 100644
--- a/xs.h
+++ b/xs.h
@@ -96,6 +96,7 @@ int xs_list_in(const xs_list *list, const xs_val *val);
 xs_str *xs_join(const xs_list *list, const char *sep);
 xs_list *xs_split_n(const char *str, const char *sep, int times);
 #define xs_split(str, sep) xs_split_n(str, sep, XS_ALL)
+xs_list *xs_list_cat(xs_list *l1, const xs_list *l2);
 
 xs_dict *xs_dict_new(void);
 xs_dict *xs_dict_append_m(xs_dict *dict, const xs_str *key, const xs_val *mem, int dsz);
@@ -858,6 +859,17 @@ xs_list *xs_split_n(const char *str, const char *sep, int times)
 }
 
 
+xs_list *xs_list_cat(xs_list *l1, const xs_list *l2)
+/* concatenates list l2 to l1 */
+{
+    XS_ASSERT_TYPE(l1, XSTYPE_LIST);
+    XS_ASSERT_TYPE(l2, XSTYPE_LIST);
+
+    /* inserts at the end of l1 the content of l2 (skipping header and footer) */
+    return xs_insert_m(l1, xs_size(l1) - 1, l2 + 4, xs_size(l2) - 5);
+}
+
+
 /** dicts **/
 
 xs_dict *xs_dict_new(void)
diff --git a/xs_version.h b/xs_version.h
index a8007e7..bc84175 100644
--- a/xs_version.h
+++ b/xs_version.h
@@ -1 +1 @@
-/* dada4e932155b621ab6d66820f62ea9cf09cbb70 */
+/* 4c151c4cc5b7c6980c1f0dd733a3fab0a30f9695 */