diff --git a/contents/algorithms/binary.md b/contents/algorithms/binary.md
index 741d8aa3..c11dd1f3 100644
--- a/contents/algorithms/binary.md
+++ b/contents/algorithms/binary.md
@@ -17,7 +17,7 @@ Some helpful utility snippets:
 - Set k<sup>th</sup> bit: `num |= (1 << k)`.
 - Turn off k<sup>th</sup> bit: `num &= ~(1 << k)`.
 - Toggle the k<sup>th</sup> bit: `num ^= (1 << k)`.
-- To check if a number is a power of 2, `num & num - 1 == 0`.
+- To check if a number is a power of 2, `(num & num - 1) == 0` or `(num & (-num)) == num`.
 
 ## Corner cases