diff --git a/src/data_structures/fenwick.md b/src/data_structures/fenwick.md
index 82755b452..d423f9289 100644
--- a/src/data_structures/fenwick.md
+++ b/src/data_structures/fenwick.md
@@ -58,7 +58,7 @@ def sum(int r):
return res
def increase(int i, int delta):
- for all j with g(j) <= i <= j:
+ for all j with g(i) <= j <= i:
t[j] += delta
```
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