diff --git a/docs/datanommer_datagrepper/datanommer.rst b/docs/datanommer_datagrepper/datanommer.rst
index 80494b5..586b635 100644
--- a/docs/datanommer_datagrepper/datanommer.rst
+++ b/docs/datanommer_datagrepper/datanommer.rst
@@ -47,3 +47,72 @@ Here is the size of each table:
      user             | 6608 kB    | 2744 kB
      alembic_version  | 8192 bytes | 0 bytes
     (6 rows)
+
+
+The 3 columns are::
+
+    Table – The name of the table
+    Size – The total size that this table takes
+    External Size – The size that related objects of this table like indices take
+
+
+
+::
+
+    datanommer=# SELECT
+    datanommer-#    relname AS objectname,
+    datanommer-#    relkind AS objecttype,
+    datanommer-#    reltuples AS "#entries", pg_size_pretty(relpages::bigint*8*1024) AS size
+    datanommer-#    FROM pg_class
+    datanommer-#    WHERE relpages >= 8
+    datanommer-#    ORDER BY relpages DESC;
+                     objectname                 | objecttype |    #entries    |  size
+    --------------------------------------------+------------+----------------+---------
+     pg_toast_257488909                         | t          |  3.4282912e+08 | 440 GB
+     messages                                   | r          |  1.8001134e+08 | 149 GB
+     messages_datanommer_timestamp_topic_idx    | i          |  1.8001134e+08 | 13 GB
+     messages_msg_id_key                        | i          |  1.8001134e+08 | 12 GB
+     index_msg_topic                            | i          |  1.8001134e+08 | 11 GB
+     pg_toast_257488909_index                   | i          |  3.4282912e+08 | 7350 MB
+     messages_datanommer_timestamp_category_idx | i          |  1.8001134e+08 | 7069 MB
+     package_messages                           | r          | 1.14010896e+08 | 5365 MB
+     user_messages                              | r          |  1.2142492e+08 | 5165 MB
+     index_msg_category                         | i          |  1.8001134e+08 | 5087 MB
+     package_messages_pkey                      | i          | 1.14010896e+08 | 4049 MB
+     index_msg_timestamp                        | i          |  1.8001134e+08 | 3867 MB
+     messages_pkey                              | i          |  1.8001134e+08 | 3862 MB
+     user_messages_pkey                         | i          |  1.2142492e+08 | 3699 MB
+     package                                    | r          |         189348 | 11 MB
+     package_pkey                               | i          |         189348 | 8616 kB
+     user                                       | r          |          92626 | 3792 kB
+     user_pkey                                  | i          |          92626 | 2632 kB
+     pg_proc                                    | r          |           2960 | 632 kB
+     pg_toast_2618                              | t          |            249 | 456 kB
+     pg_depend                                  | r          |           7601 | 448 kB
+     pg_attribute                               | r          |           2913 | 432 kB
+     pg_depend_reference_index                  | i          |           7601 | 344 kB
+     pg_description                             | r          |           4714 | 328 kB
+     pg_depend_depender_index                   | i          |           7601 | 280 kB
+     pg_proc_proname_args_nsp_index             | i          |           2960 | 232 kB
+     pg_collation                               | r          |            779 | 200 kB
+     pg_description_o_c_o_index                 | i          |           4714 | 184 kB
+     pg_statistic                               | r          |            422 | 152 kB
+     pg_attribute_relid_attnam_index            | i          |           2913 | 128 kB
+     pg_operator                                | r          |            770 | 112 kB
+     pg_class                                   | r          |            395 | 104 kB
+     pg_rewrite                                 | r          |            126 | 96 kB
+     pg_proc_oid_index                          | i          |           2960 | 88 kB
+     pg_type                                    | r          |            406 | 80 kB
+     pg_attribute_relid_attnum_index            | i          |           2913 | 80 kB
+     sql_features                               | r          |            716 | 64 kB
+    (37 rows)
+
+
+The 4 columns are::
+
+    objectname – The name of the object
+    objecttype – r for the table, i for an index, t for toast data, ...
+    #entries – The number of entries in the object (e.g. rows)
+    size – The size of the object
+
+(source for these queries: https://wiki-bsse.ethz.ch/display/ITDOC/Check+size+of+tables+and+objects+in+PostgreSQL+database )