diff --git a/plugins/qpa/sharingplatformcontext.cpp b/plugins/qpa/sharingplatformcontext.cpp
index a318bf0795..a6e4b2bd83 100644
--- a/plugins/qpa/sharingplatformcontext.cpp
+++ b/plugins/qpa/sharingplatformcontext.cpp
@@ -50,6 +50,8 @@ bool SharingPlatformContext::makeCurrent(QPlatformSurface *surface)
 {
     Window *window = static_cast<Window*>(surface);
 
+    // QOpenGLContext::makeCurrent in Qt5.12 calls platfrom->setContext before setCurrentContext
+    // but binding the content FBO looks up the format from the current context, so we need // to make sure sure Qt knows what the correct one is already
     QOpenGLContextPrivate::setCurrentContext(context());
     if (eglMakeCurrent(eglDisplay(), m_surface, m_surface, eglContext())) {
         window->bindContentFBO();