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diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
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@@ -2017,6 +2017,16 @@ A jump table for the options with a short description can be found at |Q_op|.
Use the indent heuristic for the internal
diff library.
+ linematch:{n} Enable a second stage diff on each generated
+ hunk in order to align lines. When the total
+ number of lines in a hunk exceeds {n}, the
+ second stage diff will not be performed as
+ very large hunks can cause noticeable lag. A
+ recommended setting is "linematch:60", as this
+ will enable alignment for a 2 buffer diff with
+ hunks of up to 30 lines each, or a 3 buffer
+ diff with hunks of up to 20 lines each.
+
algorithm:{text} Use the specified diff algorithm with the
internal diff engine. Currently supported
algorithms are: