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diff --git a/apps/examples/README.txt b/apps/examples/README.txt
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+++ b/apps/examples/README.txt
@@ -312,6 +312,12 @@ examples/nxtest
defined in include/nuttx/nx.h. This text focuses on text displays on
the dispaly background combined with pop-up displays over the text.
The text display will continue to update while the pop-up is visible.
+
+ NOTE: This example will *only* work with FB drivers and with LCD
+ drivers that support reading the contents of the internal LCD memory.
+ If you notice garbage on the display or a failure at the point where
+ the display should scroll, it is probably because you have an LCD
+ driver that is write-only.
The following configuration options can be selected: