diff --git a/vec/docs/README.md b/vec/docs/README.md
index 4108499..8fb0bee 100644
--- a/vec/docs/README.md
+++ b/vec/docs/README.md
@@ -180,6 +180,7 @@ bit_block_impl! {
     (u16, 16),
     (u32, 32),
     (u64, 64),
+    (u128, 128),
     (usize, core::mem::size_of::<usize>() * 8)
 }
 ```
\ No newline at end of file
diff --git a/vec/src/lib.rs b/vec/src/lib.rs
index 2b5c762..b672865 100644
--- a/vec/src/lib.rs
+++ b/vec/src/lib.rs
@@ -203,6 +203,7 @@ bit_block_impl! {
     (u16, 16),
     (u32, 32),
     (u64, 64),
+    (u128, 128),
     (usize, core::mem::size_of::<usize>() * 8)
 }