diff --git a/docs/demos/pinn_forward/poisson.1d.neumanndirichlet.rst b/docs/demos/pinn_forward/poisson.1d.neumanndirichlet.rst
index 4b6edb03d..7dd6c89d5 100644
--- a/docs/demos/pinn_forward/poisson.1d.neumanndirichlet.rst
+++ b/docs/demos/pinn_forward/poisson.1d.neumanndirichlet.rst
@@ -8,7 +8,7 @@ We will solve a Poisson equation:
 
 .. math:: \Delta u = 2, \qquad x \in [-1, 1],
 
-with the Neumman boundary conditions on the right boundary
+with the Neumann boundary conditions on the right boundary
 
 .. math:: \left.\dfrac{du}{dx}\right|_{x=1} =4