diff --git a/support/tools/MoM/process_mom_sql.py b/support/tools/MoM/process_mom_sql.py
index 2e979385589dd73a85381c18a6d15e6833a442a8..798668db295b4c2ca0f5a01bf0ec0999d92ef186 100755
--- a/support/tools/MoM/process_mom_sql.py
+++ b/support/tools/MoM/process_mom_sql.py
@@ -1,5 +1,12 @@
 #!/usr/bin/python
 
+# This script reads infile and creates sql files for each part in the infile in the
+# outdir directory. It also replaces references to the indatabase with references
+# to the outdatabase.
+# It creates a file for each view and table and trigger that is defined in the infile.
+# It creates separate files for filling the tables.
+# The script assumes the infile is a dump of a MySQL MoM 3 database.
+
 infile = "backup_lofar_mom3.sql.1"
 indatabase = "lofar_mom3"
 outdatabase = "lofar_mom_test_rt_trigger"