title: Add a field description to a DB2/400 file
body: <p>I have a set of files in a library on an AS/400/iSeries/System-I/whatever-IBM-wants-me-to-call-it-these-days which I do not have DDS for (created in SQL I gather) but to which I would like to add field descriptions.  I cannot find a way to do this on the 400.  </p>
  
  <p>Does anyone know how I can add field description?  Is directly updating SYSIBM.SQLCOLUMNS to set COLUMN_TEXT safe?</p>
  
  <p>(I am not looking for general SQL answers here, only DB2/400 specific answers.  Unfortunately given IBMs renamings of this platform and the very un-google-able name they chose, it is almost impossible to find answers (or especially to prove that there is NOT an answer) to such questions without spending ages looking through there voluminous, impenetrable documentation)</p>