1 files changed, 3 insertions, 0 deletions
diff --git a/diff.h b/diff.h
index 54c2590b4f..78b4091dd5 100644
--- a/diff.h
+++ b/diff.h
@@ -174,6 +174,9 @@ const char *diff_get_color(int diff_use_color, enum color_diff ix);
 	diff_get_color((o)->use_color, ix)
 
 
+const char *diff_line_prefix(struct diff_options *);
+
+
 extern const char mime_boundary_leader[];
 
 extern void diff_tree_setup_paths(const char **paths, struct diff_options *);