1 files changed, 1 insertions, 0 deletions
diff --git a/hash.h b/hash.h
index 3334bf93..2d2ef37e 100644
--- a/hash.h
+++ b/hash.h
@@ -97,6 +97,7 @@ val hash_values(val hash);
 val hash_pairs(val hash);
 val hash_alist(val hash);
 val hash_uni(val hash1, val hash2, val joinfun, val map1fun, val map2fun);
+val hash_join(val hash1, val hash2, val joinfun, val h1dfl, val h2dfl);
 val hash_diff(val hash1, val hash2);
 val hash_symdiff(val hash1, val hash2);
 val hash_isec(val hash1, val hash2, val joinfun);