diff --git a/300s School/ME 2046 - Digital Control Theory/2025-01-09 Sampling Theory.md b/300s School/ME 2046 - Digital Control Theory/2025-01-09 Sampling Theory.md
index c3087f8d..abe37441 100644
--- a/300s School/ME 2046 - Digital Control Theory/2025-01-09 Sampling Theory.md	
+++ b/300s School/ME 2046 - Digital Control Theory/2025-01-09 Sampling Theory.md	
@@ -48,5 +48,7 @@ The spectrum of the sampled signal is also a periodic function of frequency with
 ![[Pasted image 20250109181319.png]]
  A lot of times, we need to filter the high frequency stuff out, or else we'll get some issues with aliasing.
 
+**Band Limited** $|X(j\omega)|=0 \forall |\omega|>\omega_0$
+
 # Shannon's Sampling Theorem
 - x(t) can be uniquely determined if the samples have sampling frequency with a specific
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