diff --git a/_data/ntnu-courses.yml b/_data/ntnu-courses.yml
index a756f6e..8fce2d0 100644
--- a/_data/ntnu-courses.yml
+++ b/_data/ntnu-courses.yml
@@ -3,6 +3,7 @@
   course: tfe4152
   desc: Design av integrerte kretser, høsten 2020.
   updated: 2020-12-16
+  href: tfe4152/summary
 - 
   course: ttt4120
   desc: Digital signalbehandling, høsten 2020.
diff --git a/ntnu/tfe4152/summary/summary.md b/ntnu/tfe4152/summary/summary.md
new file mode 100644
index 0000000..4806a79
--- /dev/null
+++ b/ntnu/tfe4152/summary/summary.md
@@ -0,0 +1,10 @@
+---
+title: "Oppsumering av TFE4152"
+description: "Stort sett formler i faget TFE4152, høsten 2020."
+date: 2020-12-16
+math: true
+---
+
+## Dioder
+
+$$ \Phi_0 = \frac{k_B T}{q}\ln\left(\frac{N_A N_D}{n_i}\right) $$
\ No newline at end of file