diff --git a/C++/prime-palindrome.cpp b/C++/prime-palindrome.cpp
index c869a3942..839e0db85 100644
--- a/C++/prime-palindrome.cpp
+++ b/C++/prime-palindrome.cpp
@@ -1,4 +1,4 @@
-// Time:  O(n^(3/2))
+// Time:  O(n^(1/2) * (logn + n^(1/2)))
 // Space: O(logn)
 
 class Solution {