diff --git a/doc/tutorials/writing.rst b/doc/tutorials/writing.rst
index 3bdbff1..31187ff 100644
--- a/doc/tutorials/writing.rst
+++ b/doc/tutorials/writing.rst
@@ -1,10 +1,10 @@
-Writing
--------
+Converting and Saving
+---------------------
 
 Save as GPX file
 ^^^^^^^^^^^^^^^^
 
-The :py:meth:`~to_gpx` allows to export a :py:class:`~ezgpx.gpx.GPX` object as a GPX file.
+The :py:meth:`~to_gpx` allows to export a :py:class:`~ezgpx.gpx.GPX` object as a `GPX <https://en.wikipedia.org/wiki/GPS_Exchange_Format>`_ file.
 
 ::
 
@@ -16,4 +16,55 @@ The :py:meth:`~to_gpx` allows to export a :py:class:`~ezgpx.gpx.GPX` object as a
     # Do stuff with GPX object
 
     # Save as GPX file
-    gpx.to_gpx("new_file.gpx")
\ No newline at end of file
+    gpx.to_gpx("new_file.gpx")
+
+Save as KML file
+^^^^^^^^^^^^^^^^
+
+The :py:meth:`~to_kml` allows to export a :py:class:`~ezgpx.gpx.GPX` object as a `KML <https://en.wikipedia.org/wiki/Keyhole_Markup_Language>`_ file.
+
+::
+
+    from ezgpx import GPX
+
+    # Parse GPX file
+    gpx = GPX("file.gpx")
+
+    # Do stuff with GPX object
+
+    # Save as KML file
+    gpx.to_kml("new_file.kml")
+
+Save as CSV file
+^^^^^^^^^^^^^^^^
+
+The :py:meth:`~to_csv` allows to export a :py:class:`~ezgpx.gpx.GPX` object as a `CSV <https://en.wikipedia.org/wiki/Comma-separated_values>`_ file.
+
+::
+
+    from ezgpx import GPX
+
+    # Parse GPX file
+    gpx = GPX("file.gpx")
+
+    # Do stuff with GPX object
+
+    # Save as CSV file
+    gpx.to_csv("new_file.csv", columns=["lat", "lon", "ele"])
+
+Convert to Pandas Dataframe
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The :py:meth:`~to_kml` allows to convert a :py:class:`~ezgpx.gpx.GPX` object as a `Pandas Dataframe <https://pandas.pydata.org/docs/reference/api/pandas.DataFrame.html>`_.
+
+::
+
+    from ezgpx import GPX
+
+    # Parse GPX file
+    gpx = GPX("file.gpx")
+
+    # Do stuff with GPX object
+
+    # Convert to Pandas Dataframe
+    df = gpx.to_dataframe()
\ No newline at end of file
diff --git a/examples/conversion.py b/examples/conversion.py
index 9a746b4..6228627 100644
--- a/examples/conversion.py
+++ b/examples/conversion.py
@@ -3,11 +3,14 @@
 # Parse GPX file
 gpx = ezgpx.GPX("file.gpx")
 
-# Convert to Pandas Dataframe
-df = gpx.to_dataframe()
+# Save as GPX file
+gpx.to_gpx("new_file.gpx")
+
+# Save as KML file
+gpx.to_kml("new_file.kml")
 
-# Convert to CSV
-gpx.to_csv("file.csv", columns=["lat", "lon", "ele"])
+# Save as CSV file
+gpx.to_csv("new_file.csv", columns=["lat", "lon", "ele"])
 
-# Convert to KML
-gpx.to_kml("file.kml")
\ No newline at end of file
+# Convert to Pandas Dataframe
+df = gpx.to_dataframe()
\ No newline at end of file
diff --git a/ezgpx/gpx/gpx.py b/ezgpx/gpx/gpx.py
index 52579cd..78b63ce 100644
--- a/ezgpx/gpx/gpx.py
+++ b/ezgpx/gpx/gpx.py
@@ -494,7 +494,7 @@ def merge(self, gpx: GPX):
         if self.gpx.extensions is None:
             self.gpx.extensions = gpx.gpx.extensions
 
-    def to_string(self) -> str:
+    def to_gpx_string(self) -> str:
         """
         Convert the GPX object to a string.
 
diff --git a/notes.md b/notes.md
index 2cbdf47..1be5c80 100644
--- a/notes.md
+++ b/notes.md
@@ -37,6 +37,7 @@
 - [gpxpy](https://github.com/tkrajina/gpxpy)
 
 ## 📝 TO DO LIST !!
+- Change to project.toml (https://setuptools.pypa.io/en/latest/userguide/pyproject_config.html)
 - Documentation for conversion + Medium
 - Sub classes for GPX & KML writers
 - Merge method