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-rw-r--r--Documentation/git-difftool.txt1
-rwxr-xr-xgit-difftool--helper.sh1
2 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/git-difftool.txt b/Documentation/git-difftool.txt
index 498b1610f..573843211 100644
--- a/Documentation/git-difftool.txt
+++ b/Documentation/git-difftool.txt
@@ -64,6 +64,7 @@ with custom merge tool commands and has the same value as `$MERGED`.
Specify a custom command for viewing diffs.
'git-difftool' ignores the configured defaults and runs
`$command $LOCAL $REMOTE` when this option is specified.
+ Additionally, `$BASE` is set in the environment.
-g::
--gui::
diff --git a/git-difftool--helper.sh b/git-difftool--helper.sh
index 524f5ea8a..0594bf7ca 100755
--- a/git-difftool--helper.sh
+++ b/git-difftool--helper.sh
@@ -49,6 +49,7 @@ launch_merge_tool () {
fi
if use_ext_cmd; then
+ export BASE
eval $GIT_DIFFTOOL_EXTCMD '"$LOCAL"' '"$REMOTE"'
else
run_merge_tool "$merge_tool"