diff --git a/config.txt b/config.txt
index dea6437..bcbcbe3 100644
--- a/config.txt
+++ b/config.txt
@@ -1 +1 @@
-mode=main
+mode=login-integrated
diff --git a/src/login_module.c b/src/login_module.c
new file mode 100644
index 0000000..7ee6b24
--- /dev/null
+++ b/src/login_module.c
@@ -0,0 +1,6 @@
+/* Login feature source file for Git branch practice. */
+
+int Login_CheckCredentials(const char *user, const char *password)
+{
+    return (user != 0) && (password != 0);
+}