diff --git a/src/8_differential_equations_2.md b/src/8_differential_equations_2.md
index 2a6cc7b6af844252d626dbe0815dc71d1deb4400..3d361ba2147354767baaed3139b3f07180f78d64 100644
--- a/src/8_differential_equations_2.md
+++ b/src/8_differential_equations_2.md
@@ -272,7 +272,7 @@ derivative.
 
 For the Schrödinger equation, we could supply the initial conditions
 
-$$\psi(x,0)= \psi_{0}(x) \ & \ \psi(0,t) = \psi{t, L} = 0.$$
+$$\psi(x,0)= \psi_{0}(x) \ & \ \psi(0,t) = \psi(L, t) = 0 \text{for all $t$}.$$
 
 This particular set of boundary conditions corresponds to a particle in a box,
 a situation which is used as the base model for many derivations in quantum