diff --git a/docs/problems.md b/docs/problems.md
index e30d580..85954d7 100644
--- a/docs/problems.md
+++ b/docs/problems.md
@@ -173,5 +173,5 @@
 
 80_Anderson_thermostat
 
-*****: Problems that are related to Nobel Prize-winning studies
+** * **: Problems that are related to Nobel Prize-winning studies