diff --git a/docs/Project.toml b/docs/Project.toml
index 9d710adc5..39c7c4931 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -15,3 +15,7 @@ Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 SplittableRandoms = "8efc31e9-3fb0-4277-b18c-5a3d5d07abad"
 StatsFuns = "4c63d2b9-4356-54db-8cca-17b64c39e42c"
 StatsPlots = "f3b207a7-027a-5e70-b257-86293d7955fd"
+
+[compat]
+Documenter = "0.27"
+
diff --git a/examples/stan/funnel.stan b/examples/stan/funnel.stan
index 70e673f79..94fde874e 100644
--- a/examples/stan/funnel.stan
+++ b/examples/stan/funnel.stan
@@ -1,5 +1,6 @@
 data {
     int<lower=1> dim;
+    real<lower=0> scale;
 }
 parameters {
   real y;
@@ -7,5 +8,5 @@ parameters {
 }
 model {
   y ~ normal(0, 3);
-  x ~ normal(0, exp(y/2));
-}
\ No newline at end of file
+  x ~ normal(0, exp(y/scale));
+}
diff --git a/src/targets/toy_stan_target.jl b/src/targets/toy_stan_target.jl
index bd81c1a43..02b7bfeb1 100644
--- a/src/targets/toy_stan_target.jl
+++ b/src/targets/toy_stan_target.jl
@@ -17,10 +17,10 @@ toy_stan_unid_target(n_trials = 100000, n_successes = ceil(Int, n_trials/2)) =
         json(; n_trials, n_successes)
     )
 
-stan_funnel(dim = 9) = 
+stan_funnel(dim = 9, scale = 2.0) = 
     StanLogPotential(
         stan_example_path("funnel.stan"), 
-        json(; dim)
+        json(; dim, scale)
     )
 
 stan_bernoulli(y = [0,1,0,0,0,0,0,0,0,1]) =
@@ -62,4 +62,4 @@ json(; variables...) =
         map(
             pair -> "\"$(pair[1])\" : $(pair[2])", 
             collect(variables)), ",") * 
-    "}"
\ No newline at end of file
+    "}"