diff --git a/300s School/ME 2016 - Nonlinear Dynamical Systems 1/2024-12-02 Delay Differential Equation.md b/300s School/ME 2016 - Nonlinear Dynamical Systems 1/2024-12-02 Delay Differential Equation.md
index 2f143e57..6a15e455 100644
--- a/300s School/ME 2016 - Nonlinear Dynamical Systems 1/2024-12-02 Delay Differential Equation.md	
+++ b/300s School/ME 2016 - Nonlinear Dynamical Systems 1/2024-12-02 Delay Differential Equation.md	
@@ -14,4 +14,7 @@ Then after some steps
 $$\frac{dx}{dt} = -x(t-1) \rightarrow dx' = -x'(t'-1)dt'$$
 And then this can be solved at each interval.
 - This gets annoying.
-- Need to solve at each interval over and over.
\ No newline at end of file
+- Need to solve at each interval over and over.
+## Stability of DDEs
+For ODE: equilibrium point is 0 of derivative
+For DDE: dx/dt is still 0
\ No newline at end of file