diff --git a/docs/mhf4u7.md b/docs/mhf4u7.md
index 6dc3d93..2439c6e 100644
--- a/docs/mhf4u7.md
+++ b/docs/mhf4u7.md
@@ -448,10 +448,12 @@ $$f´(x) = nx^{n-1}$$
 If the slope of a tangent is:
 
  - positive/negative, that value on the derivative graph is also positive/negative, respectively
- - zero (e.g., linear equations), that value on the derivative graph is on the x-axis 
+ - zero, that value on the derivative graph is on the x-axis 
 
 Points of inflection on the original function become maximum/minimum points on the derivative graph.
 
+The derivative of a linear equation is always constant.
+
 ## Resources
 
  - [IB Math Analysis and Approaches Syllabus](/resources/g11/ib-math-syllabus.pdf)