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-rw-r--r--doc/avtools-common-opts.texi12
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diff --git a/doc/avtools-common-opts.texi b/doc/avtools-common-opts.texi
index 111812da78..340f00c400 100644
--- a/doc/avtools-common-opts.texi
+++ b/doc/avtools-common-opts.texi
@@ -120,13 +120,25 @@ Set the logging level used by the library.
@var{loglevel} is a number or a string containing one of the following values:
@table @samp
@item quiet
+Show nothing at all; be silent.
@item panic
+Only show fatal errors which could lead the process to crash, such as
+and assert failure. This is not currently used for anything.
@item fatal
+Only show fatal errors. These are errors after which the process absolutely
+cannot continue after.
@item error
+Show all errors, including ones which can be recovered from.
@item warning
+Show all warnings and errors. Any message related to possibly
+incorrect or unexpected events will be shown.
@item info
+Show informative messages during processing. This is in addition to
+warnings and errors. This is the default value.
@item verbose
+Same as @code{info}, except more verbose.
@item debug
+Show everything, including debugging information.
@end table
By default the program logs to stderr, if coloring is supported by the