diff --git a/education/math/MATH1210 (calc 1)/Integrals.md b/education/math/MATH1210 (calc 1)/Integrals.md
index c29bace..2d54b2b 100644
--- a/education/math/MATH1210 (calc 1)/Integrals.md	
+++ b/education/math/MATH1210 (calc 1)/Integrals.md	
@@ -202,4 +202,4 @@ Visualized as a set of rectangles, each rectangle would have a corner on the top
 
 The Riemann Sum definition of the area between two curves is as follows:
 
-$$ \lim_{n \to \infty} \sum_{i = 0}^n $$
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+$$ \lim_{n \to \infty} \sum_{i = 0}^n (f(x_i)-g(x_i)\cdot \Delta x)$$
\ No newline at end of file