diff --git a/src/12_band_structures_in_higher_dimensions.md b/src/12_band_structures_in_higher_dimensions.md
index cbca532ff684d4e581409aedda5b7bd56600e4e4..78aef2e03679acc6ba98a4e275b665a2384fef9b 100644
--- a/src/12_band_structures_in_higher_dimensions.md
+++ b/src/12_band_structures_in_higher_dimensions.md
@@ -230,6 +230,6 @@ Suppose we have a square lattice with lattice constant $a$, with a periodic pote
     ??? hint
         This is analogous to the 1D case: the states that interact have $k$-vectors $(\pi/a,0)$ and $(-\pi/a,0)$; ($\psi_{+}\sim e^{i\pi x /a}$ ; $\psi_{-}\sim e^{-i\pi x /a}$).
 
-2. Let's now study the more complicate case of  state $\mathbf{q}=(\pi/a,\pi/a)$. How many $k$-points have the same energy? Which ones?
+2. Let's now study the more complicated case of  state $\mathbf{q}=(\pi/a,\pi/a)$. How many $k$-points have the same energy? Which ones?
 3. Write down the nearly free electron model Hamiltonian near this point.
 4. Find its eigenvalues.
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