1 files changed, 1 insertions, 0 deletions
diff --git a/hash.h b/hash.h
index f9fcb75b..542b3e1a 100644
--- a/hash.h
+++ b/hash.h
@@ -89,6 +89,7 @@ val hash_proper_subset(val hash1, val hash2);
 val hash_update(val hash, val fun);
 val hash_update_1(val hash, val key, val fun, val init);
 val hash_revget(val hash, val value, val test, val keyfun);
+val hash_keys_of(val hash, val value, val test, val keyfun);
 val hash_invert(val hash, val joinfun, val unitfun, struct args *hashv_args);
 
 void hash_process_weak(void);