diff --git a/300s School/NUCE 2100 - Fundamentals of Nuclear Engineering/2024-09-24 Week 5.md b/300s School/NUCE 2100 - Fundamentals of Nuclear Engineering/2024-09-24 Week 5.md
index dc0b5a4c..87389601 100644
--- a/300s School/NUCE 2100 - Fundamentals of Nuclear Engineering/2024-09-24 Week 5.md	
+++ b/300s School/NUCE 2100 - Fundamentals of Nuclear Engineering/2024-09-24 Week 5.md	
@@ -23,4 +23,6 @@ It's a bad approximation when:
 s(x) is generation
 Basically it's just solving differential equations. 
 # Module 6.4 - Multiplying Media
-Add fission
\ No newline at end of file
+Add fission
+Modes can happen.
+Interestingly, the higher order modes of neutron diffusion are subcritical. They fade away over time