diff --git a/Doc/lib/libregsub.tex b/Doc/lib/libregsub.tex
index bbb7671..4c1497c 100644
--- a/Doc/lib/libregsub.tex
+++ b/Doc/lib/libregsub.tex
@@ -7,6 +7,7 @@
 Warning: these functions are not thread-safe.
 
 \renewcommand{\indexsubitem}{(in module regsub)}
+
 \begin{funcdesc}{sub}{pat\, repl\, str}
 Replace the first occurrence of pattern \var{pat} in string
 \var{str} by replacement \var{repl}.  If the pattern isn't found,
@@ -23,13 +24,28 @@
 \code{gsub('', '-', 'abc')} returns \code{'-a-b-c-'}.
 \end{funcdesc}
 
-\begin{funcdesc}{split}{str\, pat\optional{\, retain}}
+\begin{funcdesc}{split}{str\, pat\optional{\, maxsplit}}
 Split the string \var{str} in fields separated by delimiters matching
 the pattern \var{pat}, and return a list containing the fields.  Only
 non-empty matches for the pattern are considered, so e.g.
 \code{split('a:b', ':*')} returns \code{['a', 'b']} and
-\code{split('abc', '')} returns \code{['abc']}.
-If the optional \var{retain} argument is true, the separators are also
-inserted in the list, so e.g. \code{split('a:::b', ':*', 1)} returns
-\code{['a', ':::', 'b']}.
+\code{split('abc', '')} returns \code{['abc']}.  The \var{maxsplit}
+defaults to 0. If it is nonzero, only \var{maxsplit} number of splits
+occur, and the remainder of the string is returned as the final
+element of the list.
+\end{funcdesc}
+
+\begin{funcdesc}{splitx}{str\, pat\optional{\, maxsplit}}
+Split the string \var{str} in fields separated by delimiters matching
+the pattern \var{pat}, and return a list containing the fields as well
+as the separators.  For example, \code{splitx('a:::b', ':*')} returns
+\code{['a', ':::', 'b']}.  Otherwise, this function behaves the same
+as \code{split}.
+\end{funcdesc}
+
+\begin{funcdesc}{capwords}{s\optional{\, pat}}
+Capitalize words separated by optional pattern \var{pat}.  The default
+pattern uses any characters except letters, digits and underscores as
+word delimiters.  Capitalization is done by changing the first
+character of each word to upper case.
 \end{funcdesc}
diff --git a/Doc/libregsub.tex b/Doc/libregsub.tex
index bbb7671..4c1497c 100644
--- a/Doc/libregsub.tex
+++ b/Doc/libregsub.tex
@@ -7,6 +7,7 @@
 Warning: these functions are not thread-safe.
 
 \renewcommand{\indexsubitem}{(in module regsub)}
+
 \begin{funcdesc}{sub}{pat\, repl\, str}
 Replace the first occurrence of pattern \var{pat} in string
 \var{str} by replacement \var{repl}.  If the pattern isn't found,
@@ -23,13 +24,28 @@
 \code{gsub('', '-', 'abc')} returns \code{'-a-b-c-'}.
 \end{funcdesc}
 
-\begin{funcdesc}{split}{str\, pat\optional{\, retain}}
+\begin{funcdesc}{split}{str\, pat\optional{\, maxsplit}}
 Split the string \var{str} in fields separated by delimiters matching
 the pattern \var{pat}, and return a list containing the fields.  Only
 non-empty matches for the pattern are considered, so e.g.
 \code{split('a:b', ':*')} returns \code{['a', 'b']} and
-\code{split('abc', '')} returns \code{['abc']}.
-If the optional \var{retain} argument is true, the separators are also
-inserted in the list, so e.g. \code{split('a:::b', ':*', 1)} returns
-\code{['a', ':::', 'b']}.
+\code{split('abc', '')} returns \code{['abc']}.  The \var{maxsplit}
+defaults to 0. If it is nonzero, only \var{maxsplit} number of splits
+occur, and the remainder of the string is returned as the final
+element of the list.
+\end{funcdesc}
+
+\begin{funcdesc}{splitx}{str\, pat\optional{\, maxsplit}}
+Split the string \var{str} in fields separated by delimiters matching
+the pattern \var{pat}, and return a list containing the fields as well
+as the separators.  For example, \code{splitx('a:::b', ':*')} returns
+\code{['a', ':::', 'b']}.  Otherwise, this function behaves the same
+as \code{split}.
+\end{funcdesc}
+
+\begin{funcdesc}{capwords}{s\optional{\, pat}}
+Capitalize words separated by optional pattern \var{pat}.  The default
+pattern uses any characters except letters, digits and underscores as
+word delimiters.  Capitalization is done by changing the first
+character of each word to upper case.
 \end{funcdesc}