diff --git a/docs/11_nearly_free_electron_model.md b/docs/11_nearly_free_electron_model.md
index bb6c9346c857a66198a5cdf65f740a152481bce5..1aad11b79937631fcef21374068d9380e9ad1150 100644
--- a/docs/11_nearly_free_electron_model.md
+++ b/docs/11_nearly_free_electron_model.md
@@ -331,7 +331,7 @@ $$
 where $\lambda>0$. In this exercise, we will find the band structure of this crystal in two ways:
 
 - By means of the nearly free electron model explained in this lecture.
-- By means of the tight binding model explained in [lecture 7](/7_tight_binding).
+- By means of the tight binding model explained in [lecture 7](7_tight_binding.md).
 
 We first find the band structure using the nearly free electron model. 
 
diff --git a/docs/12_band_structures_in_higher_dimensions.md b/docs/12_band_structures_in_higher_dimensions.md
index 13e83671d1e03c4460aa330c0173644fd016be0a..2d0fe884aba996edc33f1e999f33779111bbc7e0 100644
--- a/docs/12_band_structures_in_higher_dimensions.md
+++ b/docs/12_band_structures_in_higher_dimensions.md
@@ -232,7 +232,7 @@ A joint absorbtion of a photon and a phonon collision may excite an electron acr
 ## Exercises
 
 ### Exercise 1: 3D Fermi surfaces
-Using the [periodic table](../fermi_surfaces) of the Fermi surfaces, answer the following questions:
+Using the [periodic table](fermi_surfaces.md) of the Fermi surfaces, answer the following questions:
 
 1. Find 4 elements that are well described by the nearly-free electron model and 4 that are poorly described by it.
 2. Is the Fermi surface of lithium better described by the free electron model or the NFEM? What about potassium? Why?