diff --git a/src/common/python/function.cpp b/src/common/python/function.cpp
index 0029bd1f1..5e3cb1813 100644
--- a/src/common/python/function.cpp
+++ b/src/common/python/function.cpp
@@ -57,6 +57,11 @@ QString pymeshlab::Function::description() const
 	return funDescription;
 }
 
+void pymeshlab::Function::setDescription(const QString& newDescription)
+{
+	funDescription = newDescription;
+}
+
 unsigned int pymeshlab::Function::parametersNumber() const
 {
 	return parameters.size();
diff --git a/src/common/python/function.h b/src/common/python/function.h
index 93b30466b..9ba7cb5af 100644
--- a/src/common/python/function.h
+++ b/src/common/python/function.h
@@ -45,6 +45,7 @@ public:
 	QString pythonFunctionName() const;
 	QString meshlabFunctionName() const;
 	QString description() const;
+	void setDescription(const QString& newDescription);
 	unsigned int parametersNumber() const;
 	QStringList pythonFunctionParameters() const;
 	bool contains(const QString& pythonParameter) const;
diff --git a/src/common/python/function_set.cpp b/src/common/python/function_set.cpp
index b6a7d76c2..66e3cf9d9 100644
--- a/src/common/python/function_set.cpp
+++ b/src/common/python/function_set.cpp
@@ -95,7 +95,24 @@ void pymeshlab::FunctionSet::loadIOPlugin(IOPlugin* iop)
 			QString pythonFilterName = outputFormat.toLower();
 			Function f(pythonFilterName, originalFilterName, "Save " + outputFormat + " format.");
 			RichParameterList rps = iop->initSaveParameter(outputFormat, *dummyMeshDocument.mm());
-
+			if (outputFormat.toUpper() == "PLY"){
+				f.setDescription(
+					"Ply files also support saving custom attributes. You'll need to add an "
+					"additional boolean parameter for each one of that you want to save, and use "
+					"only non-capital letters for parameter names. These parameters have a prefix "
+					"for each type of custom attribute:</br>"
+					"- ``__ca_vs__``: Custom Attribute Vertex Scalar;</br>"
+					"- ``__ca_vp__``: Custom Attribute Vertex Point;</br>"
+					"- ``__ca_fs__``: Custom Attribute Face Scalar;</br>"
+					"- ``__ca_fp__``: Custom Attribute Face Point;</br>"
+					"For example, if your mesh has a custom per vertex scalar attribute called "
+					"'MyAttribute', you can save it in a ply file by calling:</br>"
+					"``ms.save_current_mesh(file_name='myfile.ply', __ca_vs__myattribute=True)`` "
+					"</br>"
+					"You can check the parameters available on a mesh by calling the MeshSet "
+					"method :py:meth:`pmeshlab.MeshSet.filter_parameter_values`, with first "
+					"parameter ``ply``.");
+			}
 			//filename parameter
 			QString sv = "file_name." + outputFormat;
 			RichSaveFile of("file_name", sv, outputFormat, "File Name", "The name of the file to save");
diff --git a/src/meshlabplugins/io_base/baseio.cpp b/src/meshlabplugins/io_base/baseio.cpp
index fbb87ae57..e37b645f9 100644
--- a/src/meshlabplugins/io_base/baseio.cpp
+++ b/src/meshlabplugins/io_base/baseio.cpp
@@ -414,25 +414,25 @@ void BaseMeshIOPlugin::save(const QString &formatName, const QString &fileName,
 			// if pname starts with __CA_VS__, it is a PLY per-vertex scalar custom attribute
 			if (pname.startsWith("__CA_VS__")) {
 				if (par.getBool(pname)) {        // if it is true, add to save list
-					pi.addPerVertexScalarAttribute(qUtf8Printable(pname.mid(4)), scalarPlyType);
+					pi.addPerVertexScalarAttribute(qUtf8Printable(pname.mid(9)), scalarPlyType);
 				}
 			}
 			// if pname starts with __CA_VP__, it is a PLY per-vertex point3m custom attribute
 			else if (pname.startsWith("__CA_VP__")) {
 				if (par.getBool(pname)) {             // if it is true, add to save list
-					pi.addPerVertexPoint3mAttribute(qUtf8Printable(pname.mid(5)), scalarPlyType);
+					pi.addPerVertexPoint3mAttribute(qUtf8Printable(pname.mid(9)), scalarPlyType);
 				}
 			}
 			// if pname starts with __CA_FS__, it is a PLY per-face scalar custom attribute
 			else if (pname.startsWith("__CA_FS__")) {
 				if (par.getBool(pname)) {             // if it is true, add to save list
-					pi.addPerFaceScalarAttribute(qUtf8Printable(pname.mid(4)), scalarPlyType);
+					pi.addPerFaceScalarAttribute(qUtf8Printable(pname.mid(9)), scalarPlyType);
 				}
 			}
 			// if pname starts with __CA_FP__, it is a PLY per-face point3m custom attribute
 			else if (pname.startsWith("__CA_FP__")) {
 				if (par.getBool(pname)) {
-					pi.addPerFacePoint3mAttribute(qUtf8Printable(pname.mid(5)), scalarPlyType);
+					pi.addPerFacePoint3mAttribute(qUtf8Printable(pname.mid(9)), scalarPlyType);
 				}
 			}
 		}