From 9472013365a06ab0b85c68d445790b23be6003ef Mon Sep 17 00:00:00 2001
From: Lars kleyn Winkel <l.kleynwinkel@student.tudelft.nl>
Date: Mon, 10 Feb 2020 15:34:22 +0000
Subject: [PATCH] Update src/7_tight_binding_model_sol.md

---
 src/7_tight_binding_model_sol.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/7_tight_binding_model_sol.md b/src/7_tight_binding_model_sol.md
index f61f521e..6d1a683c 100644
--- a/src/7_tight_binding_model_sol.md
+++ b/src/7_tight_binding_model_sol.md
@@ -52,5 +52,5 @@ pyplot.yticks([0.5, 1], [0, r'$\frac{L}{2\pi a}\sqrt{\frac{\kappa}{m}}$'])
 
 4.
 
-
+Hint: The group velocity is inversely proportional
 
-- 
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