diff --git a/internal/config/config.go b/internal/config/config.go
index 4a5dc23..2f22243 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -21,6 +21,9 @@ type HostConfig struct {
 }
 
 func GetConfigDir() (string, error) {
+	if xdgConfigHome := os.Getenv("XDG_CONFIG_HOME"); xdgConfigHome != "" {
+		return filepath.Join(xdgConfigHome, "fgj"), nil
+	}
 	home, err := os.UserHomeDir()
 	if err != nil {
 		return "", err
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index 6912963..3d55ee9 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -75,6 +75,20 @@ func TestGetConfigDir(t *testing.T) {
 	}
 }
 
+func TestGetConfigDir_XDG(t *testing.T) {
+	t.Setenv("XDG_CONFIG_HOME", "/custom/config")
+
+	dir, err := GetConfigDir()
+	if err != nil {
+		t.Fatalf("Unexpected error: %v", err)
+	}
+
+	expected := "/custom/config/fgj"
+	if dir != expected {
+		t.Errorf("Expected %q, got %q", expected, dir)
+	}
+}
+
 func TestGetConfigPath(t *testing.T) {
 	path, err := GetConfigPath()
 	if err != nil {