1 files changed, 5 insertions, 0 deletions
diff --git a/range-diff.h b/range-diff.h
index 190593f0c7..08a50b6e98 100644
--- a/range-diff.h
+++ b/range-diff.h
@@ -5,6 +5,11 @@
 
 #define RANGE_DIFF_CREATION_FACTOR_DEFAULT 60
 
+/*
+ * Compare series of commmits in RANGE1 and RANGE2, and emit to the
+ * standard output.  NULL can be passed to DIFFOPT to use the built-in
+ * default.
+ */
 int show_range_diff(const char *range1, const char *range2,
 		    int creation_factor, int dual_color,
 		    struct diff_options *diffopt);