diff --git a/content/session/blackboxing.md b/content/session/blackboxing.md
index dffb856..268f55c 100644
--- a/content/session/blackboxing.md
+++ b/content/session/blackboxing.md
@@ -42,6 +42,7 @@ To prepare, read in advance the following three texts:
 ## References
 
 ![](bib:3774cea9-752e-4a45-9aa5-c4f0d89e601d)
+
 ![](bib:d17e1db9-c2d3-4512-a72e-854900e97cbf)