Updated version.  I kept "The BLOCKSIZE environment variable" in
the -P description since it is the first time the man page metions
BLOCKSIZE.

 - todd

Index: bin/df/df.1
===================================================================
RCS file: /cvs/src/bin/df/df.1,v
retrieving revision 1.48
diff -u -p -u -r1.48 df.1
--- bin/df/df.1 10 Aug 2016 19:46:43 -0000      1.48
+++ bin/df/df.1 31 Dec 2022 21:29:50 -0000
@@ -100,6 +100,9 @@ with the possibly stale statistics that 
 .It Fl P
 Print out information in a stricter format designed to be parsed
 by portable scripts.
+The
+.Ev BLOCKSIZE
+environment variable is ignored when this option is specified.
 .It Fl t Ar type
 Indicate the actions should only be taken on
 file systems of the specified
@@ -125,14 +128,13 @@ the last option given overrides the othe
 .Sh ENVIRONMENT
 .Bl -tag -width BLOCKSIZE
 .It Ev BLOCKSIZE
-If the environment variable
-.Ev BLOCKSIZE
-is set, and the
-.Fl h
+Display block counts in units of size
+.Dv BLOCKSIZE .
+Ignored if any of the
+.Fl h , k
 or
-.Fl k
-options are not specified, the block counts will be displayed in units of that
-size block.
+.Fl P
+options are specified.
 .El
 .Sh EXIT STATUS
 .Ex -std df

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