diff --git a/src/14_doping_and_devices.md b/src/14_doping_and_devices.md
index 2daf2782f5f608fdb4e40f7fceefa13a089ba50d..bd2366a6cf560cf6bc4c499c70aee7da6214b41d 100644
--- a/src/14_doping_and_devices.md
+++ b/src/14_doping_and_devices.md
@@ -174,7 +174,7 @@ $$
 n_h \approx N_V e^{E_v-E_F/kT}.
 $$
 We express the lhs with the quadratic equation solution and solve for Fermi level:
-$$E_F = E_G - kT\ln[N_C/(N_D-N_A)], \textrm{ for } N_D > N_A$$
+$$E_F = E_c - kT\ln[N_C/(N_D-N_A)], \textrm{ for } N_D > N_A$$
 and
 $$E_F = kT\ln[N_V/(N_A-N_D)], \textrm{ for } N_A > N_D$$