diff --git a/docs/custom_priors.ipynb b/docs/custom_priors.ipynb
index 7c8a3b4..77d0005 100644
--- a/docs/custom_priors.ipynb
+++ b/docs/custom_priors.ipynb
@@ -916,7 +916,7 @@
       },
       "source": [
         "To avoid silent errors or unexpected behaviour we also raise exceptions\n",
-        "(in most casdes) when user passes a prior for a key that does not exist in the model."
+        "(in most cases) when user passes a prior for a key that does not exist in the model."
       ]
     }
   ],