diff --git a/notebooks/ES_2D_Heat_Equation.py b/notebooks/ES_2D_Heat_Equation.py
index bb6e0b8..21f5f39 100644
--- a/notebooks/ES_2D_Heat_Equation.py
+++ b/notebooks/ES_2D_Heat_Equation.py
@@ -111,7 +111,7 @@ def interactive_prior_fields(n):
 # to make it easier for the Ensemble Smoother to find the solution.
 alpha_t = alphas[0]
 
-# Resultion on the `x` direction (nothing to worry about really)
+# Resolution in the x-direction (nothing to worry about really)
 dx = 1
 
 # Calculate maximum `dt`.