diff --git a/_data/profile.yml b/_data/profile.yml
index 379fd906..41eb1595 100644
--- a/_data/profile.yml
+++ b/_data/profile.yml
@@ -25,7 +25,7 @@ short_bio: >-
 
 portrait_url: /assets/images/photos/portrait.jpg
 portrait_caption: >-
-  Photo by Manja Vitolic on Unsplash.
+  Photo by Manja Vitolic on Unsplash (this caption is optional, comment it out to disable).
 
 education:
 - name: Peking University