diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index f95564454cb..4e4ec6d353d 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -574,6 +574,21 @@ For example, simply moving through a file that contains hundreds of
 thousands of characters per line is slow, and consumes a lot of CPU.
 This is a known limitation of Emacs with no solution at this time.
 
+*** Display artifacts on GUI frames on X-based systems.
+
+This is known to be caused by using double-buffering (which is enabled
+by default in Emacs 26 and later).  The artifacts typically appear
+after commands that cause Emacs to scroll the display.
+
+You can disable double-buffering by evaluating the following form:
+
+  (modify-all-frames-parameters '((inhibit-double-buffering . t)))
+
+To make this permanent, add it to your ~/.emacs init file.
+
+Note that disabling double-buffering will cause flickering of the
+display in some situations.
+
 *** Self-documentation messages are garbled.
 
 This means that the file 'etc/DOC' doesn't properly correspond