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-rw-r--r--runtime/doc/mbyte.txt6
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diff --git a/runtime/doc/mbyte.txt b/runtime/doc/mbyte.txt
index a8c5670352..47fd4f3343 100644
--- a/runtime/doc/mbyte.txt
+++ b/runtime/doc/mbyte.txt
@@ -646,6 +646,12 @@ widespread as file format.
A composing or combining character is used to change the meaning of the
character before it. The combining characters are drawn on top of the
preceding character.
+
+Nvim largely follows the definition of extended grapheme clusters in UAX#29
+in the Unicode standard, with some modifications: An ascii char will always
+start a new cluster. In addition 'arabicshape' enables the combining of some
+arabic letters, when they are shaped to be displayed together in a single cell.
+
Too big combined characters cannot be displayed, but they can still be
inspected using the |g8| and |ga| commands described below.
When editing text a composing character is mostly considered part of the