diff --git a/src/14_doping_and_devices.md b/src/14_doping_and_devices.md
index 54871e9c5bbc2e1669e707010548441fde0eb066..7772e017fda9442ebb09947224478883ce54abe9 100644
--- a/src/14_doping_and_devices.md
+++ b/src/14_doping_and_devices.md
@@ -86,7 +86,7 @@ $$n_e - n_h + n_D - n_A = N_D - N_A$$
 
 We already know $n_e$ and $n_h$.
 
-$$n_D = N_D \frac{1}{e^{(E_D-E_F)/kT} + 1}, n_A = N_A \frac{1}{e^{-(E_A+E_F)/kT} + 1}$$
+$$n_D = N_D \frac{1}{e^{(E_D-E_F)/kT} + 1}, n_A = N_A \frac{1}{e^{(E_F-E_A)/kT} + 1}$$
 
 Simplification: