diff --git a/Grade 10/Math/MPM2DZ/Unit 3: Quadratic Functions.md b/Grade 10/Math/MPM2DZ/Unit 3: Quadratic Functions.md
index eef1222..918619a 100644
--- a/Grade 10/Math/MPM2DZ/Unit 3: Quadratic Functions.md	
+++ b/Grade 10/Math/MPM2DZ/Unit 3: Quadratic Functions.md	
@@ -11,6 +11,8 @@
  - `Optimal value`: y-value for vertex
  - `Domain`: List of all valid x-values for relation, expressed as $`D = {num, num2, num3}`$ or as a relation such as $`D = {x E R, x != 0, x < 50`$
  - `Range`: List of all valid y-values for relation, expressed as $`R = {num, num2, num3}`$ or as a relation such as $`D = {y E R, y != 0, y < 50`$
+ - `Relation`: Set of ordered pairs of numbers
+ - `Function`: A relation in which no y-coordinates share an x-coordinate (e.g., circles are not functions)
 
 ## Parabolas