improve docs for SCRIPT command

h2/src/docsrc/help/help.csv

@@ -155,6 +155,9 @@ NODATA will not emit INSERT statements.
 If the DROP option is specified, drop statements are created for tables, views,
 and sequences. If the block size is set, CLOB and BLOB values larger than this
 size are split into separate blocks.
+BLOCKSIZE is used when writing out LOB data, and specifies the point at the 
+values transition from being inserted as inline values, to be inserted using 
+out-of-line commands.
 
 If no file name is specified, the
 script is returned as a result set. This command can be used to create a backup