diff --git a/articles/is-subsequence.md b/articles/is-subsequence.md
index 2d725e239..115af2e01 100644
--- a/articles/is-subsequence.md
+++ b/articles/is-subsequence.md
@@ -472,7 +472,7 @@ public class Solution {
 
 ### Time & Space Complexity
 
-- Time complexity: $O(n + m)$
+- Time complexity: $O(m)$
 - Space complexity: $O(1)$
 
 > Where $n$ is the length of the string $s$ and $m$ is the length of the string $t$.