diff --git a/posts.go b/posts.go
index 15176b7..82907ba 100644
--- a/posts.go
+++ b/posts.go
@@ -1180,7 +1180,7 @@ func (p *PublicPost) ActivityObject(app *App) *activitystreams.Object {
 	for _, handle := range mentions {
 		actorIRI, err := app.db.GetProfilePageFromHandle(app, handle)
 		if err != nil {
-			log.Info("Couldn't find this user locally or remotely")
+			log.Info("Couldn't find user '%s' locally or remotely", handle)
 			continue
 		}
 		mentionedUsers[handle] = actorIRI