diff --git a/system theoretic process analysis.md b/system theoretic process analysis.md
index e6c5d7dc8..bc62e2519 100644
--- a/system theoretic process analysis.md	
+++ b/system theoretic process analysis.md	
@@ -19,4 +19,6 @@
 		- optionally find [[sub hazards]], which might also help define further constraints
 	- step two: model the control structure
 		- ![[Pasted image 20210718234132.png]]
-		- a control structure is a system model that is composed of feedb
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+		- a control structure is a system model that is composed of feedback control loops.
+			- a good control structure will enforce the system level constraints.
+		- 
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