diff --git a/.readthedocs.yml b/.readthedocs.yml
index 82838f4..7378063 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -7,6 +7,11 @@ build:
   apt_packages:
     - graphviz
 
+sphinx:
+  builder: html
+  configuration: docs/conf.py
+  fail_on_warning: true
+
 python:
   install:
     - method: pip
diff --git a/docs/background/example_figure.py b/docs/background/example_figure.py
index 2ba5afc..59055c6 100644
--- a/docs/background/example_figure.py
+++ b/docs/background/example_figure.py
@@ -42,12 +42,9 @@ def simple_figure(th_par, magnification,
     dynspec = np.abs(dynwave)**2
 
     # Create conjugate and then secondary spectrum
-    cs = ConjugateSpectrum.from_dynamic_spectrum(dynspec, f=f, t=t, noise=0.,
-                                                 d_eff=d_eff, mu_eff=mu_eff,
-                                                 theta=th_par,
-                                                 magnification=magnification)
-    tau = cs.tau
-    fd = cs.fd
+    cs = ConjugateSpectrum.from_dynamic_spectrum(dynspec, f=f, t=t, noise=0.)
+    tau = cs.tau << u.us
+    fd = cs.fd << u.mHz
     secspec = cs.secspec
 
     # Create dynamic wavefield