diff --git a/bool.go b/bool.go
index 6fa1015..3d0be47 100644
--- a/bool.go
+++ b/bool.go
@@ -94,9 +94,9 @@ func str2bool(str string) (bool, error) {
 	}
 
 	switch strings.ToLower(strings.TrimSpace(str)) {
-	case "on":
+	case "on", "yes", "y":
 		return true, nil
-	case "off":
+	case "off", "no", "n":
 		return false, nil
 	default:
 		return false, newErr(str, "bool")
diff --git a/bool_test.go b/bool_test.go
index a9b0983..faff8ed 100644
--- a/bool_test.go
+++ b/bool_test.go
@@ -158,6 +158,10 @@ func TestBoolE(t *testing.T) {
 		{uint8(0.00), false, false},
 		{nil, false, false},
 		{false, false, false},
+		{"NO", false, false},
+		{"no", false, false},
+		{"N", false, false},
+		{"n", false, false},
 		{"false", false, false},
 		{"FALSE", false, false},
 		{"False", false, false},
@@ -195,6 +199,10 @@ func TestBoolE(t *testing.T) {
 
 		// true/scale
 		{true, true, false},
+		{"YES", true, false},
+		{"yes", true, false},
+		{"Y", true, false},
+		{"y", true, false},
 		{"true", true, false},
 		{"TRUE", true, false},
 		{"True", true, false},