error strings should not be capitalized
diff --git a/examples/main.go b/examples/main.go
index c18e404..53369b0 100644
--- a/examples/main.go
+++ b/examples/main.go
@@ -22,7 +22,7 @@
 	parts := strings.Split(value, ",")
 
 	if len(parts) != 2 {
-		return errors.New("Expected two numbers separated by a ,")
+		return errors.New("expected two numbers separated by a ,")
 	}
 
 	x, err := strconv.ParseInt(parts[0], 10, 32)