diff --git a/src/9_crystal_structure_solutions.md b/src/9_crystal_structure_solutions.md
index eb17de4d14306a72f9414447591fc95ce9de08dd..f931cc1d1024b8e57f8669574a68c431afa7cbd5 100644
--- a/src/9_crystal_structure_solutions.md
+++ b/src/9_crystal_structure_solutions.md
@@ -100,9 +100,9 @@ $V = a^3$
 
 ??? hint "Visual hint"
 
-    Consider the atom at (0.25,0.25,0.25) coordinates in the interactive diamond lattice image.
+    Consider the atom at (0.25,0.25,0.25) coordinates in the interactive diamond lattice image. Look at its neighbours.
 
-4 nearest neighbours: $(\frac{1}{4},\frac{1}{4},\frac{1}{4})$ and $(\frac{1}{4},\frac{1}{4},\frac{1}{4}) + \mathbf{a_i}  $ where $i = 1,2,3$
+4 nearest neighbours: $-(\frac{1}{4},\frac{1}{4},\frac{1}{4})$ and $-(\frac{1}{4},\frac{1}{4},\frac{1}{4}) + \mathbf{a_i}  $ where $i = 1,2,3$
 
 ### Subquestion 5