diff --git a/TBD.txt b/TBD.txt
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+-- fix indentation in all source files
+
+   Do not use some fixed-width spacing.  Use tabs.  Someday, editors will
+   distinguish between "indentation" (which should be done with tabs), and
+   "alignment" which should be done with spaces.  That way, you choose your
+   own indentation, and everything just works.
+
+
+-- change "HDFS" everywhere to "HDFs" (or something)
+
+   for easier distinction from "HDF5"
+
+
+-- maybe parse_options.c should just parse options, not create tests.
+
+   The latter brings an ugly mix of calls across files.  Fixing involves
+   having parse routines just set flags in params, then, in ior.c, someone
+   checks flags and calls test-creation stuff.  Should also move
+   test-creation to ior.c [Results creation, too.]
+
+
+-- collect various special-purpose parameter-fixing into one place.
+
+   see e.g. CheckRunSettings().  Should each aiori have a "fix the
+   parameters" generic function, as well?  This could be called at a known
+   time, allowing incompatibilities to be handled in a regular way.
+
+
+-- does MPIIO_GetFileSize() have to be in aiori.h?
+
+
+-- change integers to 0x'..', in aiori.h
+
+
+-- add hdfs-related command-line options
+
+   (e.g. HDFS user-name, replica-count, etc.)
+   see ior.h
+   see init_IOR_Param_t(), in ior.c
+
+
+-- is the getenv() I added to ior.c a problem for Win support?
+
+
+-- see "TBD" notes in src/Makefile.am
+
+   (1) for HDFS:
+
+   # TBD: figure out how to find this from the corresponding bin/ dir in $PATH
+   #      or pick an environment var to use (and set it in modulefiles)
+   #      or provide a config-flag, to set a variable we use here
+
+
+   (2) for PLFS:
+
+   # TBD: modulefiles don't add PLFS_VER to env, but you can find it embedded in
+   #      $PLFS_HOME.  configure.ac should extract this for us.  Then we should
+   #      add -D... to ior_CPPFLAGS, here.  Then aiori-PLFS.c can conditionalize
+   #      compilation of calls that vary according to PLFS version.
+
+
+
+
+
+---------------------------------------------------------------------------
+S3
+---------------------------------------------------------------------------
+
+
+-- RemoveFile (ior.c) calls POSIX "access" to see whether file exists
+
+   This is called between iterations, when iterations > 1.  Should use
+   backend->GetFileSize(), or something, and catch errors.  Or the aiori
+   struct could be extended to include a lower-level "stat" that could
+   return 0 for non-existent files.
+
+
+-- add 'init' and 'exit' functions to aiori struct
+
+   This would allow HDFS/S3/etc to do their one-time initializations and
+   cleanups.  Call from top-level in ior.c
+
+   Something also needed in AioriBind().
+
+
+-- ior should assert the IOR_TRUNC flag in params, when opening?
+
+   The CREAT flag does not reset a file, if it already exists, when opening
+   for write.  [But ... wait.  If you're opening for WRITE, you should be
+   resetting it anyhow.  D'oh.]
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