diff --git a/document_en/lazysegtree.md b/document_en/lazysegtree.md
index 61384d5..2f7738e 100644
--- a/document_en/lazysegtree.md
+++ b/document_en/lazysegtree.md
@@ -17,7 +17,7 @@ For simplicity, in this document, we assume that the oracles `op`, `e`, `mapping
 
 ```cpp
 (1) lazy_segtree<S, op, e, F, mapping, composition, id> seg(int n);
-(2) lazy_segtree<S, op, e, F, mapping, composition, id> seg(vector<T> v);
+(2) lazy_segtree<S, op, e, F, mapping, composition, id> seg(vector<S> v);
 ```
 
 The following should be defined.
diff --git a/document_ja/lazysegtree.md b/document_ja/lazysegtree.md
index cb4ba89..463f2a1 100644
--- a/document_ja/lazysegtree.md
+++ b/document_ja/lazysegtree.md
@@ -19,7 +19,7 @@
 
 ```cpp
 (1) lazy_segtree<S, op, e, F, mapping, composition, id> seg(int n);
-(2) lazy_segtree<S, op, e, F, mapping, composition, id> seg(vector<T> v);
+(2) lazy_segtree<S, op, e, F, mapping, composition, id> seg(vector<S> v);
 ```
 
 - モノイドの型 `S`