Include docstring

jdaviz/helpers.py

@@ -54,7 +54,8 @@ def load_data(self, data, data_label=None, format=None):
                 raise TypeError("`SpectrumCollection` detected. Please "
                                 "provide a `Spectrum1D`.")
             elif type(data) is not Spectrum1D:
-                raise TypeError("Data is not a Spectrum1D object or compatible file")
+                raise TypeError("Data is not a Spectrum1D object or "
+                                "compatible file.")
         self._app.add_data(data, data_label)
         self._app.add_data_to_viewer('spectrum-viewer', data_label)
 
@@ -63,6 +64,16 @@ def get_spectra(self):
         return self._app.get_data_from_viewer('spectrum-viewer')
 
     def get_regions(self):
+        """
+        Retrieves glue subset objects from the spectrum viewer and converts
+        them to `~specutils.SpectralRegion` objects.
+
+        Returns
+        -------
+        spec_regs : dict
+            Dictionary wherein the values are the converted subsets and the
+            keys are the name reference of the subset objects.
+        """
         regions = self._app.get_subsets_from_viewer('spectrum-viewer')
 
         spec_regs = {}