diff --git a/model/recipe/ingredients/ingredient.h b/model/recipe/ingredients/ingredient.h
index 1b58c49..5aace81 100644
--- a/model/recipe/ingredients/ingredient.h
+++ b/model/recipe/ingredients/ingredient.h
@@ -6,7 +6,8 @@
 using namespace std;
 
 /**
- * @brief The Ingredient class represents an ingredient, which is classified by a food group, and has a name and an ID. An ingredient cannot be included on its own in a recipe, and must be paired with a Unit in a RecipeIngredient Object.
+ * @brief The Ingredient class represents an ingredient, which is classified by a food group, and has a name and an ID.
+ * An ingredient cannot be included on its own in a recipe, and must be paired with a Unit in a RecipeIngredient Object.
  */
 
 class Ingredient
diff --git a/model/recipe/ingredients/recipeingredient.h b/model/recipe/ingredients/recipeingredient.h
index be5369d..486b5a5 100644
--- a/model/recipe/ingredients/recipeingredient.h
+++ b/model/recipe/ingredients/recipeingredient.h
@@ -7,6 +7,10 @@
 
 using namespace std;
 
+/**
+ * @brief The RecipeIngredient class represents both an ingredient and a unit of measure, to be used in a recipe object.
+ */
+
 class RecipeIngredient : public Ingredient
 {
 public:
diff --git a/model/recipe/ingredients/unitofmeasure.h b/model/recipe/ingredients/unitofmeasure.h
index 988618d..89bc010 100644
--- a/model/recipe/ingredients/unitofmeasure.h
+++ b/model/recipe/ingredients/unitofmeasure.h
@@ -14,9 +14,10 @@ class UnitOfMeasure
 public:
     UnitOfMeasure();
 private:
-    string name;
-    string plural;
-    string abbreviation;
+    string name;                //The name of the unit of measure.
+    string plural;              //The plural name.
+    string abbreviation;        //A short version of the unit.
+    float siBaseUnitEquivalent; //The ratio when compared to the base SI unit for this unit. For example: 1 cup = 237mL.
 };
 
 #endif // UNITOFMEASURE_H