diff --git a/doc/short_vignettes/mutationdominance_vignette.md b/doc/short_vignettes/mutationdominance_vignette.md
index 76cbe3ecf..cefad7de0 100644
--- a/doc/short_vignettes/mutationdominance_vignette.md
+++ b/doc/short_vignettes/mutationdominance_vignette.md
@@ -64,7 +64,7 @@ p = {
     "recregions": [fwdpy11.PoissonInterval(0, 1., rho / float(4 * pop.N))],
     "rates": (0.0, 1e-3, None),
     "prune_selected": False,
-    "demography": None,
+    "demography": fwdpy11.ForwardDemesGraph.tubes([pop.N], burnin=10),
     "simlen": 10 * pop.N,
 }
 params = fwdpy11.ModelParams(**p)
diff --git a/doc/short_vignettes/neutralmutsafter_vignette.md b/doc/short_vignettes/neutralmutsafter_vignette.md
index 6735cd6df..e411fa0dd 100644
--- a/doc/short_vignettes/neutralmutsafter_vignette.md
+++ b/doc/short_vignettes/neutralmutsafter_vignette.md
@@ -42,7 +42,7 @@ p = {
     "recregions": [fwdpy11.PoissonInterval(0, 1., rho / float(4 * pop.N))],
     "rates": (0.0, 1e-3, None),
     "prune_selected": False,
-    "demography": None,
+    "demography": fwdpy11.ForwardDemesGraph.tubes([pop.N], burnin=10),
     "simlen": 10 * pop.N,
 }
 params = fwdpy11.ModelParams(**p)
diff --git a/doc/short_vignettes/poptour_vignette.md b/doc/short_vignettes/poptour_vignette.md
index 00f890f72..4b7030113 100644
--- a/doc/short_vignettes/poptour_vignette.md
+++ b/doc/short_vignettes/poptour_vignette.md
@@ -46,7 +46,7 @@ p = {
     "recregions": [fwdpy11.PoissonInterval(0, 1., rho / float(4 * pop.N))],
     "rates": (0.0, 1e-3, None),
     "prune_selected": False,
-    "demography": None,
+    "demography": fwdpy11.ForwardDemesGraph.tubes([pop.N], burnin=10),
     "simlen": 10 * pop.N,
 }
 params = fwdpy11.ModelParams(**p)
diff --git a/doc/short_vignettes/recapitation.md b/doc/short_vignettes/recapitation.md
index 2cc6fd3f7..032ea6ac8 100644
--- a/doc/short_vignettes/recapitation.md
+++ b/doc/short_vignettes/recapitation.md
@@ -30,6 +30,7 @@ pop = fwdpy11.DiploidPopulation(100, 1000.0)
 pdict = {"rates": (0.0, 0.0, 0.0),
          "gvalue": fwdpy11.Multiplicative(2.),
          "simlen": 10,
+         "demography": fwdpy11.ForwardDemesGraph.tubes([100], burnin=10, burnin_is_exact=True),
         }
 params = fwdpy11.ModelParams(**pdict)
 rng = fwdpy11.GSLrng(54321)