diff --git a/doc/latex.rst b/doc/latex.rst
index f4fac96776c..5ad2a83a602 100644
--- a/doc/latex.rst
+++ b/doc/latex.rst
@@ -586,19 +586,19 @@ start of the chapter::
 
      \begingroup
      \sphinxsetup{%
-         pre_border-width=2pt,
-         pre_padding=5pt,
+         pre_border-width=2pt,% alias name of verbatimborder
+         pre_padding=5pt,% alias name of verbatimsep
          pre_border-radius=5pt,
          pre_background-TeXcolor={named}{OldLace},
          pre_border-TeXcolor={named}{Gold},
          TitleColor={named}{DarkGoldenrod},
          hintBorderColor={named}{LightCoral},
-         attentionborder=3pt,
-         attentionBorderColor={named}{Crimson},
-         attentionBgColor={named}{FloralWhite},
+         attentionborder=3pt,% or div.attention_border-width
+         attentionBorderColor={named}{Crimson},% div.attention_border-TeXcolor
+         attentionBgColor={named}{FloralWhite},% div.attention_background-TeXcolor
          noteborder=2pt,
          noteBorderColor={named}{Olive},
-         div.caution_border-width=3pt,
+         div.caution_border-width=3pt,% alias for cautionborder
          div.caution_border-TeXcolor={named}{Cyan},
          div.caution_background-TeXcolor={named}{LightCyan}%
      }
diff --git a/sphinx/texinputs/sphinxlatexliterals.sty b/sphinx/texinputs/sphinxlatexliterals.sty
index 68c9523f42b..35fc9ca9fb5 100644
--- a/sphinx/texinputs/sphinxlatexliterals.sty
+++ b/sphinx/texinputs/sphinxlatexliterals.sty
@@ -62,9 +62,6 @@
 % Skip to next page if not enough space at bottom
 \RequirePackage{needspace}
 
-\newbox\spx@tempboxa
-\newbox\spx@tempboxb
-
 % Based on use of "fancyvrb.sty"'s Verbatim.
 % - with framing allowing page breaks ("framed.sty")
 % - with breaking of long lines (exploits Pygments mark-up),
@@ -121,9 +118,6 @@
 % it will arrive here already transformed into horizontal boxes,
 % interline penalties and glues.
 %
-% TODO: "open borders" at page breaks via First, Mid, Last "frame commands"
-% passing the information here to set the
-% \spx@boxes@border@{bottom,top} to zero appropriately
 \long\def\spx@verb@FrameCommand #1#2#3{%
   % These \hskips are for fancyvrb.sty measuring and will make the
   % framing "adapt" to an indented context.
diff --git a/sphinx/texinputs/sphinxpackageboxes.sty b/sphinx/texinputs/sphinxpackageboxes.sty
index 14d4eb1ed3f..befddf6c1fb 100644
--- a/sphinx/texinputs/sphinxpackageboxes.sty
+++ b/sphinx/texinputs/sphinxpackageboxes.sty
@@ -12,9 +12,8 @@
 \newbox\spx@tempboxa
 \newbox\spx@tempboxb
 
-% WIP
 % Internal dimens, conditionals, and color parameters involved
-% in \spx@boxes@fcolorbox@init which is to be set by callers
+% in \spx@boxes@fcolorbox@setup which is to be set by callers
 \newif\ifspx@boxes@withshadow         
 \newif\ifspx@boxes@insetshadow         
 \newif\ifspx@boxes@withbackgroundcolor
@@ -76,11 +75,11 @@
    {\PackageWarningNoLine{sphinx}{%
        The package pict2e is required for rounded boxes.\MessageBreak
        It does not seem to be available on your system.\MessageBreak
-       The verbatimradius setting will thus be ignored}%
+       Options for setting radii will thus be ignored}%
     \AtEndDocument{\PackageWarningNoLine{sphinx}{%
        I issued a warning which may have gotten lost in the\MessageBreak
        gigantic console output: pict2e.sty was not found,\MessageBreak
-       and verbatimradius has been ignored}}%
+       and radii setting options have been ignored}}%
    \def\spx@boxes@fcolorbox@rounded{\spx@boxes@fcolorbox}%
    }%
 }%
@@ -276,7 +275,8 @@
 %%%%%%%%
 % \spx@boxes@fcolorbox@rounded
 %
-% Various radii but only one borderwidth. No shadow
+% Various radii but only one border-width parameter.
+% Shadow too.
 
 % wrappers for pict2e usage if old
 % Better not to copy over 2020 pict2e definitions in case