diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index 0c8c82bfdfe..6db59ef20f4 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -139,8 +139,8 @@ N string2IntWithUnitPrefix(std::string_view s)
 
 /**
  * Pretty-print a byte value, e.g. 12433615056 is rendered as `11.6
- * GiB`. If `align` is set, the number will be right-justified
- * (e.g. `__11.6 GiB`).
+ * GiB`. If `align` is set, the number will be right-justified by
+ * padding with spaces on the left.
  */
 std::string renderSize(uint64_t value, bool align = false);