diff --git a/reference/image/functions/imagegrabscreen.xml b/reference/image/functions/imagegrabscreen.xml
index c50f65eedc..2702f81a6d 100644
--- a/reference/image/functions/imagegrabscreen.xml
+++ b/reference/image/functions/imagegrabscreen.xml
@@ -15,6 +15,11 @@
Grabs a screenshot of the whole screen.
+
+
+ This function is only available on Windows.
+
+