diff --git a/slides/cse4562sp2018/2018-01-31-SQL+Physical.html b/slides/cse4562sp2018/2018-01-31-SQL+Physical.html
index 0a78db22..e37803e6 100644
--- a/slides/cse4562sp2018/2018-01-31-SQL+Physical.html
+++ b/slides/cse4562sp2018/2018-01-31-SQL+Physical.html
@@ -353,6 +353,7 @@
 
         <section>
           <svg data-src="graphics/2018-01-31-mem_bulk_loading.svg" class="stretch"/>
+          <imagecredit>openclipart.org</imagecredit>
         </section>
 
         <section>