updated oracle_tablespace_space2.sql

Author: HariSekhon

oracle_tablespace_space2.sql

@@ -15,6 +15,10 @@
 
 -- Oracle - Show Tablespace Size, Space Used GB and Percentage Used
 --
+--  Calculations assume an 8KB block size, which you should verify like this:
+--
+--      SELECT value FROM v$parameter WHERE name = 'db_block_size';
+--
 -- Tested on Oracle 19c
 
 SELECT