diff --git a/src/lib.rs b/src/lib.rs
index 624c8db..f5507ae 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,6 +14,8 @@ const BITS: u64 = 64;
 type Block = u64;
 type Storage = HashMap<u64, Block, BitBuildHasher>;
 
+pub type BitHashMap<V> = HashMap<u64, V, BitBuildHasher>;
+
 #[inline]
 fn block_bit(x: u64, d: u64) -> (u64, u64) {
     (x / d, x % d)