diff --git a/f.go b/f.go
index c532483..c8e946f 100644
--- a/f.go
+++ b/f.go
@@ -11,7 +11,23 @@ import (
 )
 
 const NORMAL90CONFIDENCE = 1.6448536269514727
-const general_err_msg = "Valid inputs: 2 || * 2 || / 2 || 2 20 || * 2 20 || / 2 20 || clean || =: var || op var || clean || help || debug || exit"
+const GENERAL_ERR_MSG = "Valid inputs: 2 || * 2 || / 2 || 2 20 || * 2 20 || / 2 20 || clean || =: var || op var || clean || help || debug || exit"
+
+// Distribution interface
+// https://go.dev/tour/methods/9
+
+type Distribution interface {
+	Samples() []float64
+}
+
+type Lognormal struct {
+	low  float64
+	high float64
+}
+
+func (l Lognormal) Samples() []float64 {
+
+}
 
 // Actually, I should look up how do do a) enums in go, b) union types
 type Lognormal struct {
@@ -27,7 +43,7 @@ type Dist struct {
 
 // Parse line into Distribution
 func parseLineErr(err_msg string) (string, Dist, error) {
-	fmt.Println(general_err_msg)
+	fmt.Println(GENERAL_ERR_MSG)
 	fmt.Println(err_msg)
 	return "", Dist{}, errors.New(err_msg)
 }
@@ -179,7 +195,7 @@ EventForLoop:
 			case words[0] == "exit" || words[0] == "e":
 				break EventForLoop
 			case words[0] == "help" || words[0] == "h":
-				fmt.Println(general_err_msg)
+				fmt.Println(GENERAL_ERR_MSG)
 				continue EventForLoop
 			case words[0] == "debug" || words[0] == "d":
 				fmt.Printf("Old dist: %v\n", old_dist)
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..9232354
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module git.nunosempere.com/NunoSempere/fermi.git
+
+go 1.22.1