diff --git a/docs/src/tutorials/sde_example.md b/docs/src/tutorials/sde_example.md
index 6b6bcf391..902decaab 100644
--- a/docs/src/tutorials/sde_example.md
+++ b/docs/src/tutorials/sde_example.md
@@ -317,7 +317,7 @@ function f(du, u, p, t)
 end
 function g(du, u, p, t)
     du[1] = √u[2] * u[1]
-    du[2] = Θ * √u[2]
+    du[2] = σ * √u[2]
 end
 ```