diff --git a/examples/core_examples/conditional_prior.py b/examples/core_examples/conditional_prior.py
index 0c6f4efd0a102c62d5c1be16111d76f85755f7b6..5da96c90ab633c28a60dae2a13c07cb9bb918d01 100644
--- a/examples/core_examples/conditional_prior.py
+++ b/examples/core_examples/conditional_prior.py
@@ -17,14 +17,14 @@ class ZeroLikelihood(bilby.core.likelihood.Likelihood):
 
 
 def condition_func_y(reference_params, x):
-    """ Condition function for our p(y|x) prior."""
+    """Condition function for our p(y|x) prior."""
     radius = 0.5 * (reference_params["maximum"] - reference_params["minimum"])
     y_max = np.sqrt(radius ** 2 - x ** 2)
     return dict(minimum=-y_max, maximum=y_max)
 
 
 def condition_func_z(reference_params, x, y):
-    """ Condition function for our p(z|x, y) prior."""
+    """Condition function for our p(z|x, y) prior."""
     radius = 0.5 * (reference_params["maximum"] - reference_params["minimum"])
     z_max = np.sqrt(radius ** 2 - x ** 2 - y ** 2)
     return dict(minimum=-z_max, maximum=z_max)