-Draws several different representations of molecules. Some common
-molecules are built in, and it can also read PDB (Protein Data Base)
-files as input. Written by Jamie Zawinski.
+Some interesting molecules. Several molecules are built in, and it can
+also read PDB (Protein Data Bank) files as input.
+
+https://en.wikipedia.org/wiki/Protein_Data_Bank_%28file_format%29
+
+Written by Jamie Zawinski; 2001.