diff --git a/README b/README
index 1c74874..97d8280 100644
--- a/README
+++ b/README
@@ -18,10 +18,10 @@ Requirements
 =============
 
 Because this document uses OpenType and TrueType fonts and produces
-tagged, accessible PDF/UA-2 output, it requires LuaLaTeX rather than
-standard LaTeX. It is supported by Overleaf (https://overleaf.com/)
-although it is not the default. More details on LuaTeX are available
-here: https://www.luatex.org/
+tagged, accessible PDF/UA-2 output, it requires LuaLaTeX
+(https://www.luatex.org/) (not XeLaTeX or PDFLaTeX). LuaLaTeX is
+supported by Overleaf (https://overleaf.com/) although it is not the
+default.
 
 On Debian or Ubuntu, install the following packages:
 
@@ -33,16 +33,13 @@ On Debian or Ubuntu, install the following packages:
   apt install latexmk texlive-luatex texlive-latex-recommended \
   texlive-latex-extra
 
-On other systems, installing a full TeX Live distribution should
-provide everything needed.
+On other systems, installing a full TeX Live distribution should provide
+everything needed. The tagging code requires TeX Live 2025 or later.  On
+Overleaf, set the version under Menu > Settings > TeX Live version.  TeX
+Live 2025 is not in Debian Trixie, but it can be installed from sid
+(unstable) without pulling in too many other packages.
 
-TeX Live 2025 or later is required. The tagging code is not in TeX
-Live 2024, where the build stops with "the key
-'document/metadata/tagging' is unknown". Debian trixie ships TeX Live
-2024. On Overleaf, set the version under Menu > Settings > TeX Live
-version; it is not always high enough by default on an older project.
-
-The two required fonts Matrix-II and OpenSans are both included in
+The two required fonts, Matrix-II and OpenSans, are both included in
 this repository, so no additional font packages are needed.
 
 
@@ -53,28 +50,28 @@ The letter is a tagged PDF declaring PDF/UA-2 (ISO 14289-2). Two keys
 in the \DocumentMetadata block at the top of the .tex file do this,
 and both are needed: tagging=on loads the kernel code that puts the
 text into the PDF's structure tree, and pdfstandard=ua-2 writes the
-conformance claim. The claim without the tagging produces a letter
-that passes a conformance checker while containing nothing a screen
-reader can read, so keep them together.
+conformance claim.
 
-Check a built letter with veraPDF (https://verapdf.org/, not packaged
-in Debian):
+You can check a built letter with veraPDF (https://verapdf.org/):
 
   verapdf -f ua2 washington_letterhead_letter-matrix-deptartment.pdf
 
 Note that a PASS is necessary but not sufficient. A letter whose body
 text is all marked as artifact passes too, because the standard only
-requires that content which is not real be an artifact. Confirm there
-is something in the structure tree as well:
+requires that content which is not real be an artifact. 
+
+You can confirm there is something in the structure tree as well:
 
   python3 -c "import pikepdf,sys; d=pikepdf.open(sys.argv[1]); \
     print(d.Root.get('/StructTreeRoot') and 'tagged' or 'UNTAGGED')" file.pdf
 
 The signature image carries an alt= description, which is what a
 screen reader announces in place of it. Keep that in place if you
-swap in your own signature. The letterhead graphic in the page header
-is treated as an artifact, like other running header content, so it
-is skipped rather than described.
+swap in your own signature.
+
+The letterhead graphic in the page header is treated as an artifact,
+like other running header content, so it is skipped rather than
+described.
 
 
 Encrypted signature files
diff --git a/washington_letterhead_letter-matrix-deptartment.tex b/washington_letterhead_letter-matrix-deptartment.tex
index c57002a..c96c89c 100644
--- a/washington_letterhead_letter-matrix-deptartment.tex
+++ b/washington_letterhead_letter-matrix-deptartment.tex
@@ -1,13 +1,4 @@
 % Tagged PDF (PDF/UA-2) accessibility setup.
-%
-% tagging=on is what actually builds the structure tree: it loads the
-% kernel code that tags paragraphs, headings, and figures. Declaring
-% pdfstandard=ua-2 on its own only writes the claim into the metadata.
-% Without tagging=on this letter validated as PDF/UA-2 while its
-% structure tree held nothing but /Document, its body text was marked
-% as artifact, and the alt= descriptions below were silently dropped:
-% a file that passes the checker and is unreadable to a screen reader.
-% Needs TeX Live 2025 or later.
 \DocumentMetadata{
   tagging=on,
   pdfversion=2.0,