diff --git a/docs/sph3u7.md b/docs/sph3u7.md
index 0cbc399..6ec5064 100644
--- a/docs/sph3u7.md
+++ b/docs/sph3u7.md
@@ -396,7 +396,7 @@ If an object as a **zero net force** in all dimensions, the forces acting on it
 
 Newton's first law of motion (also known as the **law of inertia**) states that every object will remain at rest or at constant velocity unless acted upon by an unbalanced force.
 
-Newton's second law of motion states that the force on an object is equal to its mass multiplied by its acceleration, such that $F = ma$.
+Newton's second law of motion states that the force on an object is equal to its mass multiplied by its acceleration, such that $\sum \vec{F} = m\vec{a}$.
 
 ## 2.3 - Work, energy, and power