diff --git a/tutorials/Example_6_PDE.ipynb b/tutorials/Example_6_PDE.ipynb
index 275d8c23..ed00668e 100644
--- a/tutorials/Example_6_PDE.ipynb
+++ b/tutorials/Example_6_PDE.ipynb
@@ -55,7 +55,7 @@
     "source_fun = lambda x: -2*torch.pi**2 * torch.sin(torch.pi*x[:,[0]])*torch.sin(torch.pi*x[:,[1]])\n",
     "\n",
     "# interior\n",
-    "sampling_mode = 'random' # 'radnom' or 'mesh'\n",
+    "sampling_mode = 'random' # 'random' or 'mesh'\n",
     "\n",
     "x_mesh = torch.linspace(ranges[0],ranges[1],steps=np_i)\n",
     "y_mesh = torch.linspace(ranges[0],ranges[1],steps=np_i)\n",