diff --git a/enter/5 Min Quantum Mechanics.md b/enter/5 Min Quantum Mechanics.md
index aeea6d1..7d7d2ce 100644
--- a/enter/5 Min Quantum Mechanics.md	
+++ b/enter/5 Min Quantum Mechanics.md	
@@ -91,4 +91,5 @@ Get your tablet and start writing down concepts & equations to explain it in sim
 36. what is a reaction 
 37. what is chemistry
 38. what is biology 
-39. what is 
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+39. what is economics 
+40. what is constrc
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