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+### Modifications for atop:
+
+Sort threads within process.
+Individual threads within a process (key 'y') are shown in the order of their TID. 
+With the additional key 'Y' threads within a process are sorted based on the current sort criterium.
+Show the WCHAN per thread.
+With the key 'W' is active, the wait channel is determined per thread and shown with the scheduling information (key 's').
+Show runqueue delay per thread/process.
+For every process (cumulated) and every thread the time spent waiting on the runqueue is shown as value 'RDELAY'.
+Show other modified/new metrics:
+PSI pressure during interval time is shown (system-level general).
+Counter 'avio' (average I/O time) for fast disks in microseconds or nanoseconds (system-level disk).
+Counter 'zfarc' showing the current size of the ARC (cache) for ZFSonlinux (system-level memory).
+Counter 'swcac' showing the current size of the swap cache (system-level swap).
+Counter LOCKSZ showing the virtual locked memory size (process-level memory).
+Bug fixes:
+Prevent race condition in cooperation with atopacctd.
+Avoid crash with very high load average values.
+Fix errors in reading InfiniBand states.
+
+### Modifications for atop and atopsar:
+
+Support of rawlog files spanning multiple days.
+The time specification to define the begin time (-b flag) and end time (-e flag) of both atop and atopsar is [YYYYMMDD]hhmm now.
+This also applies to the branch key ('b') when using atop interactively.
+Support reading rawlog from a pipe.
+Rawlog data can be read from a pipe by atop and atopsar with the option '-r -'. In this way, concatenated rawlog data from the command atopcat can be directly processed.
+
+### New program atopcat:
+The program atopcat concatenates rawlog files and writes this data to stdout. 
+The output can be redirected to a new rawlog file or to atop/atopsar directly via a pipe (see option '-r -' of these commands). 
+In this way e.g. weekly or monthly reports or extractions can be created.
+
+### General:
+
+The format of the raw file is compatible with version 2.5.
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