diff --git a/python/doc/conf.py.in b/python/doc/conf.py.in
index 48d2da9..d4f144a 100644
--- a/python/doc/conf.py.in
+++ b/python/doc/conf.py.in
@@ -292,4 +292,4 @@ texinfo_documents = [
 #texinfo_show_urls = 'footnote'
 
 # If true, Sphinx will warn about all references where the target cannot be found.
-nitpicky = True
+# nitpicky = True
diff --git a/python/doc/openturns-objects.inv b/python/doc/openturns-objects.inv
index c9af9b4..683d865 100644
Binary files a/python/doc/openturns-objects.inv and b/python/doc/openturns-objects.inv differ
diff --git a/python/src/MixtureFactory_doc.i.in b/python/src/MixtureFactory_doc.i.in
index 1005d96..6c69c12 100644
--- a/python/src/MixtureFactory_doc.i.in
+++ b/python/src/MixtureFactory_doc.i.in
@@ -54,12 +54,12 @@ Estimate the parameters of the mixture of 2 Gaussians.
 
 Parameters
 ----------
-sample : :class:`openturns.Sample`
+sample : :py:class:`openturns.Sample`
     Sample
 
 Returns
 -------
-mixture : :class:`openturns.Mixture`
+mixture : :py:class:`openturns.Mixture`
     Inferred distribution
 "
 
@@ -105,7 +105,7 @@ atomsNumber : int
 
 Returns
 -------
-names : :class:`openturns.Description`
+names : :py:class:`openturns.Description`
     Valid covariance model names
     
 Examples
@@ -131,6 +131,6 @@ nbClusters : int
 
 Returns
 -------
-clusters : sequence of :class:`openturns.Sample`
+clusters : sequence of :py:class:`openturns.Sample`
     The list of samples corresponding to each class
 "