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-rw-r--r--Documentation/config/mergetool.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/config/mergetool.txt b/Documentation/config/mergetool.txt
index e779a122d8..56a7eeeffb 100644
--- a/Documentation/config/mergetool.txt
+++ b/Documentation/config/mergetool.txt
@@ -85,3 +85,10 @@ mergetool.writeToTemp::
mergetool.prompt::
Prompt before each invocation of the merge resolution program.
+
+mergetool.guiDefault::
+ Set `true` to use the `merge.guitool` by default (equivalent to
+ specifying the `--gui` argument), or `auto` to select `merge.guitool`
+ or `merge.tool` depending on the presence of a `DISPLAY` environment
+ variable value. The default is `false`, where the `--gui` argument
+ must be provided explicitly for the `merge.guitool` to be used.