diff --git a/README.md b/README.md
index ea5341e..fa3604e 100644
--- a/README.md
+++ b/README.md
@@ -21,4 +21,11 @@ Reading data will be saved to `$HOME/.ketotrack/readings.json`.
 ```shell
 go build
 mv ketotrack $HOME/.local/bin
-```
\ No newline at end of file
+```
+
+## Refactoring Notes
+- [ ] Create `Record` and `Note` struct types
+- [X] Add `GKI` field to `Reading` struct type
+- [ ] Encapsulate application data with an `AppContext` struct that holds a `Records` slice
+  - [ ] `LoadRecords`, `SaveRecords`, `AddReading`, `AddNote` receiver methods
+- [ ] Standardize method names for getting user input to `handleNewNote` and `handleNewReading`
\ No newline at end of file
diff --git a/main.go b/main.go
index b0859c0..8b541dc 100644
--- a/main.go
+++ b/main.go
@@ -41,18 +41,28 @@ type Reading struct {
 	Time    time.Time `json:"time"`
 	Glucose float64   `json:"glucose"`
 	Ketone  float64   `json:"ketone"`
+	GKI     float64   `json:"GKI"`
 }
 
 // NewReading creates and returns a new Reading instance with the provided glucose and ketone levels, and records
 // the current time. The glucose value should be provided in mg/dL, while the ketone level should be in mmol/L.
 func NewReading(glucose, ketone float64) Reading {
+	var gki float64
+	if ketone == 0 {
+		gki = 0
+	} else {
+		gki = (glucose / 18) / ketone
+	}
+
 	return Reading{
 		Time:    time.Now(),
 		Glucose: glucose,
 		Ketone:  ketone,
+		GKI:     gki,
 	}
 }
 
+/*
 // GKI calculates and returns the Glucose Ketone Index of the reading.
 // The Glucose Ketone Index helps determine the efficiency of glucose and ketone levels within the body. It is
 // calculated as (glucose level in mg/dL / 18) divided by the ketone level.
@@ -61,7 +71,7 @@ func (r Reading) GKI() (float64, error) {
 		return 0, errors.New("ketone level must not be zero to calculate GKI")
 	}
 	return (r.Glucose / 18) / r.Ketone, nil
-}
+}*/
 
 func main() {
 	// Take a new reading from the user
@@ -72,23 +82,23 @@ func main() {
 	}
 
 	// Calculate GKI
-	gki, err := reading.GKI()
-	if err != nil {
-		fmt.Println(err.Error())
-		fmt.Println("You are not in ketosis.")
-		return
-	}
-	fmt.Printf("\nYour GKI is: %0.2f\n", gki)
+	//gki, err := reading.GKI()
+	//if err != nil {
+	//	fmt.Println(err.Error())
+	//	fmt.Println("You are not in ketosis.")
+	//	return
+	//}
 
-	// Display level of ketosis
+	// Display GKI and level of ketosis
+	fmt.Printf("\nYour GKI is: %0.2f\n", reading.GKI)
 	switch {
-	case gki <= 1:
+	case reading.GKI <= 1:
 		fmt.Println("You're in the highest level of ketosis.")
-	case gki < 3:
+	case reading.GKI < 3:
 		fmt.Println("You're in a high therapeutic level of ketosis.")
-	case gki < 6:
+	case reading.GKI < 6:
 		fmt.Println("You're in a moderate level of ketosis.")
-	case gki <= 9:
+	case reading.GKI <= 9:
 		fmt.Println("You're in a low level of ketosis.")
 	default:
 		fmt.Println("You are not in ketosis.")