diff --git a/education/math/MATH1210 (calc 1)/Derivatives.md b/education/math/MATH1210 (calc 1)/Derivatives.md
index 4a8d12d..580a6e0 100644
--- a/education/math/MATH1210 (calc 1)/Derivatives.md	
+++ b/education/math/MATH1210 (calc 1)/Derivatives.md	
@@ -90,4 +90,5 @@ $$ \dfrac{d}{dx}(\dfrac{f(x)}{g(x)}) = \dfrac{f'(x)g(x) -f(x)g'(x)}{(g(x))^2}  $
 
 # Exponential Rule
 $$ \dfrac{d}{dx} e^x = e^x $$
-$$ \dfrac{d}{dx}a^x
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+$$ \dfrac{d}{dx}a^x = a^x*(\ln(a)) $$
+for all $a > 0$
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