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-rw-r--r--Documentation/gitattributes.txt5
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diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 4338d023d9..80cae17f37 100644
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -776,6 +776,11 @@ with the above configuration, i.e. `j-c-diff`, with 7
parameters, just like `GIT_EXTERNAL_DIFF` program is called.
See linkgit:git[1] for details.
+If the program is able to ignore certain changes (similar to
+`git diff --ignore-space-change`), then also set the option
+`trustExitCode` to true. It is then expected to return exit code 1 if
+it finds significant changes and 0 if it doesn't.
+
Setting the internal diff algorithm
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^