Merge branch 'trunk' of github.com:PDB-REDO/dssp into trunk

README.md

@@ -6,6 +6,9 @@ with previous releases of DSSP is that it now writes out an annotated mmCIF
 file by default, storing the secondary structure information in the 
 _struct_conf category.
 
+Another new feature in this version of DSSP is that it now defines
+Poly-Proline helices as well.
+
 The DSSP program was designed by Wolfgang Kabsch and Chris Sander to
 standardize secondary structure assignment. DSSP is a database of secondary
 structure assignments (and much more) for all protein entries in the Protein

mkdssp.1

@@ -16,10 +16,12 @@ The original DSSP program wrote output in a fixed format, this version
 by default writes annotated mmCIF files, storing the secondary structure
 information in the _struct_conf category.
 .sp
-Since version 4.0 the mkdssp program also assigns PP helices.
+Since version 4.0 the mkdssp program also assigns PPII helices.
 .SH OPTIONS
 The input file can be either mmCIF or PDB format and the file may be
-gzip or bzip2 compressed.
+gzip or bzip2 compressed. Note that input files must be formatted correctly.
+E.g. PDB files must have a CRYST1 record. More info:
+https://www.wwpdb.org/documentation/file-format-content/format33/sect8.html#CRYST1
 .sp
 The output is optional, if omitted the output is written to \fIstdout\fR. If
 the name of the output file ends with either \fI.gz\fR or \fI.bz2\fR the