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diff --git a/runtime/doc/diff.txt b/runtime/doc/diff.txt
index 54d47eb28a..8c9cdc3800 100644
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+++ b/runtime/doc/diff.txt
@@ -1,4 +1,4 @@
-*diff.txt* For Vim version 7.4. Last change: 2015 Jan 19
+*diff.txt* For Vim version 7.4. Last change: 2015 Feb 03
VIM REFERENCE MANUAL by Bram Moolenaar
@@ -306,6 +306,19 @@ name or a part of a buffer name. Examples:
Also see |'diffopt'| and the "diff" item of |'fillchars'|.
+ *diff-slow* *diff_translations*
+For very long lines, the diff syntax highlighting might be slow, especially
+since it tries to match all different kind of localisations. To disable
+localisations and speed up the syntax highlighting, set the global variable
+g:diff_translations to zero: >
+
+ let g:diff_translations = 0
+<
+After setting this variable, Reload the syntax script: >
+
+ set syntax=diff
+<
+
FINDING THE DIFFERENCES *diff-diffexpr*