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diff --git a/extensions/SyntaxHighlight_GeSHi/README b/extensions/SyntaxHighlight_GeSHi/README
index fa20c0a3..c0004318 100644
--- a/extensions/SyntaxHighlight_GeSHi/README
+++ b/extensions/SyntaxHighlight_GeSHi/README
@@ -64,3 +64,10 @@ for detailed information to use some of the parameters.
* line; Corresponds to enable_line_numbers method on GeSHi
* start; Corresponds to start_line_numbers_at method on GeSHi
* strict; Corresponds to enable_strict_mode method on GeSHi
+
+== Note ==
+
+GeSHi is generous about creating HTML elements: highlighting large blocks of
+code can easily generate enough of them to crash a browser. As a guard, symbol
+highlighting is turned off for code fragments larger than 100 kB. For fragments
+larger than 200 kB, string highlighting is turned off as well.