diff --git a/source/Platform/Unix/X11Display.h b/source/Platform/Unix/X11Display.h
index 330ffba..9343705 100644
--- a/source/Platform/Unix/X11Display.h
+++ b/source/Platform/Unix/X11Display.h
@@ -10,6 +10,8 @@
 
 namespace sp {
 
+// NOTE: This class wraps a X11 Window and Screen handle
+// and is NOT a Class wrapper around X11's `Display` type.
 class X11Display : public PlatformDisplay
 {
 public :