The IBM Enterprise PL/I for z/OS documentation was refreshed in September to address some customer feedback. The following two 5.3 documents are affected in this document refresh: 

• Language Reference
• Programming Guide

The latest PL/I documents are available on the IBM Documentation site https://www.ibm.com/docs/en/epfz/5.3
The English and Japanese PDF files are available for download from the Enterprise PL/I for z/OS library page at https://www.ibm.com/support/pages/enterprise-pli-zos-documentation-library 
If you have any questions, comments or suggestions regarding the PL/I documentation,  please send them to compinfo@cn.ibm.com.