diff --git a/src/citra/citra.cpp b/src/citra/citra.cpp
index 2c9d58646..5635b6ddd 100644
--- a/src/citra/citra.cpp
+++ b/src/citra/citra.cpp
@@ -42,6 +42,7 @@
 
 #ifdef _WIN32
 extern "C" {
+// tells Nvidia drivers to use the dedicated GPU by default on laptops with switchable graphics
 __declspec(dllexport) unsigned long NvOptimusEnablement = 0x00000001;
 }
 #endif
diff --git a/src/citra_qt/main.cpp b/src/citra_qt/main.cpp
index 8b251994f..1c5047963 100644
--- a/src/citra_qt/main.cpp
+++ b/src/citra_qt/main.cpp
@@ -56,6 +56,7 @@ Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin);
 
 #ifdef _WIN32
 extern "C" {
+// tells Nvidia drivers to use the dedicated GPU by default on laptops with switchable graphics
 __declspec(dllexport) unsigned long NvOptimusEnablement = 0x00000001;
 }
 #endif