Added information about selcols in the irsa.rst documentation file
@@ -197,6 +197,20 @@ is an ra, dec pair expressed in degrees:
10.011 10.094 00h40m02.68s 10d05m38.05s 0.23 ... 0.378 0.602 0.98 5
10.006 10.018 00h40m01.33s 10d01m06.24s 0.16 ... 0.662 0.566 1.228 6
+Selecting Columns
+--------------------
+
+The IRSA service allows to query either a subset of the default columns for a given table, or additional columns that are not present by default. This can be done by listing all the required columns separated by a comma (,) in a string with the ``selcols`` argument.
+
+An example where the WISE AllSky L1b catalog needs to be queried around the star HIP 12 with just the ra, dec and w1mpro columns would be:
+
+.. code-block:: python
+
+ >>> from astroquery.irsa import Irsa
+ >>> table = Irsa.query_region("HIP 12", catalog="wise_allsky_2band_p1bm_frm", spatial="Cone", selcols="ra,dec,w1mpro")
+
+A list of available columns for each catalog can be found at https://irsa.ipac.caltech.edu/holdings/catalogs.html. The "Long Form" button at the top of the column names table must be clicked to access a full list of all available columns.
+
Other Configurations
--------------------
