diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index 38686cd..73fc5f9 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2029,7 +2029,9 @@
 						- Plan time to learn from prototype cycles
 							- Avoid hardware swamp :-> where you keep building different ways out of a problem without stopping to think
 			- DONE Week4
-			-
+				- ## Topic 18
+					-
+				- ## Topic 19
 	- LATER 概率论 (隔了一个周末)
 	  collapsed:: true
 	  SCHEDULED: <2023-06-19 Mon>