diff --git a/report/pic.go b/report/pic.go
index fd7ea63..3d709db 100644
--- a/report/pic.go
+++ b/report/pic.go
@@ -15,9 +15,12 @@ import (
 )
 
 // Pic holds path to pic along with its caption.
+// Bench field is set optionally (e.g. in case of the pic depicting
+// comparison of means).
 type Pic struct {
 	Caption  string
 	FilePath string
+	Bench    string // optionally set.
 }
 
 // PicList is a structure holding a slice of pics and {bench,algo} metadata.