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diff --git a/DOCS/man/mpv.rst b/DOCS/man/mpv.rst
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@@ -520,6 +520,9 @@ Suffix Meaning
-add Append 1 or more items (same syntax as -set)
============= ===============================================
+Keys are unique within the list. If an already present key is set, the existing
+key is removed before the new value is appended.
+
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~~~~~~~~~~~~~~