diff --git a/src/os/winheader.h b/src/os/winheader.h
index 1bac4a9..600a531 100644
--- a/src/os/winheader.h
+++ b/src/os/winheader.h
@@ -5,8 +5,13 @@
 
 namespace OsWinHeader {
 
-void ShowMessage(const char* message);
+// Accept message as const char* to avoid string copy. 
+// Mark function as inline to give compiler opportunity to optimize out-of-header usage for this trivial wrapper.
+// Add noexcept for better codegen and possible optimization.
+inline void ShowMessage(const char* message) noexcept {
+    MessageBoxA(nullptr, message, "Info", MB_OK | MB_ICONINFORMATION);
+}
 
 }
 
-#endif // ! __OS_WINHEADER_H__
+#endif // ! __OS_WINHEADER_H__
\ No newline at end of file