diff --git a/docs/ce1/ece105.md b/docs/ce1/ece105.md
index bf17244..16bfb48 100644
--- a/docs/ce1/ece105.md
+++ b/docs/ce1/ece105.md
@@ -144,7 +144,7 @@ $$W=F\Delta S$$
 
 The total net work from torque from external forces is equivalent to:
 
-$$W=\Delta E_k = \int^{\theta_f}_{\theta_i}\taud\theta$$
+$$W=\Delta E_k = \int^{\theta_f}_{\theta_i}\tau d\theta$$
 
 ### Angular momentum