diff --git a/src/library/base/man/Extract.Rd b/src/library/base/man/Extract.Rd
index 8e4a5bd79f..907cd74a3b 100644
--- a/src/library/base/man/Extract.Rd
+++ b/src/library/base/man/Extract.Rd
@@ -327,6 +327,7 @@ x$name <- value
 
   \code{\link{Syntax}} for operator precedence, and the
   Section \manual{R-lang}{Indexing}.
+  \code{\link{replace}} for replacing without modyfying the original object.
 
   \code{\link{NULL}} for details of indexing null objects.
 }
diff --git a/src/library/base/man/append.Rd b/src/library/base/man/append.Rd
index d098d0c84c..cf26786631 100644
--- a/src/library/base/man/append.Rd
+++ b/src/library/base/man/append.Rd
@@ -24,6 +24,9 @@ append(x, values, after = length(x))
 \references{
   \bibshow{R:Becker+Chambers+Wilks:1988}
 }
+\seealso{
+  \code{\link{c}} for combining vectors.
+}
 \examples{
 append(1:5, 0:1, after = 3)
 }
diff --git a/src/library/base/man/asplit.Rd b/src/library/base/man/asplit.Rd
index 4f15aa961c..b64abcf718 100644
--- a/src/library/base/man/asplit.Rd
+++ b/src/library/base/man/asplit.Rd
@@ -6,7 +6,7 @@
 asplit(x, MARGIN, drop = FALSE)
 }
 \arguments{
-  \item{x}{an array, including a matrix.}
+  \item{x}{an \link{array}, including a \link{matrix}.}
   \item{MARGIN}{a vector giving the margins to split by.
     E.g., for a matrix \code{1} indicates rows, \code{2} indicates
     columns, \code{c(1, 2)} indicates rows and columns.
diff --git a/src/library/base/man/c.Rd b/src/library/base/man/c.Rd
index 50f190bc55..d72236be2b 100644
--- a/src/library/base/man/c.Rd
+++ b/src/library/base/man/c.Rd
@@ -66,6 +66,8 @@ c(\dots)
 \seealso{
   \code{\link{unlist}} and \code{\link{as.vector}} to produce
   attribute-free vectors.
+
+  \code{\link{append}} to add values to a vector. 
 }
 \examples{
 c(1, 7:9)
diff --git a/src/library/base/man/connections.Rd b/src/library/base/man/connections.Rd
index 6375d19878..e39dc1e76b 100644
--- a/src/library/base/man/connections.Rd
+++ b/src/library/base/man/connections.Rd
@@ -688,6 +688,8 @@ socketTimeout(socket, timeout = -1)
 
   To flush output to the Windows and macOS consoles, see
   \code{\link{flush.console}}.
+
+  \code{\link{socketSelect}} for picking an available socket connection. 
 }
 
 \examples{
diff --git a/src/library/base/man/det.Rd b/src/library/base/man/det.Rd
index b098ca4770..6f752363cb 100644
--- a/src/library/base/man/det.Rd
+++ b/src/library/base/man/det.Rd
@@ -13,7 +13,7 @@ det(x, \dots)
 determinant(x, logarithm = TRUE, \dots)
 }
 \description{
-  \code{det} calculates the determinant of a matrix.  \code{determinant}
+  \code{det} calculates the determinant of a \link{matrix}.  \code{determinant}
   is a generic function that returns separately the modulus of the determinant,
   optionally on the logarithm scale, and the sign of the determinant.
   }
diff --git a/src/library/base/man/dots.Rd b/src/library/base/man/dots.Rd
index 2268544e62..b455010a45 100644
--- a/src/library/base/man/dots.Rd
+++ b/src/library/base/man/dots.Rd
@@ -52,7 +52,7 @@
   \R, see \code{\link{Reserved}}.
 
   \manual{R-intro}{The ... argument},
-  and \code{?\link[methods]{dotsMethods}} for its use in formal (S4) methods.
+  and \code{?\link[methods]{dotsMethods}} for its use in formal (S4) methods and \code{\link{chkDots}} for S3 methods. 
 }
 \examples{
 tst <- function(n, ...) ...elt(n)
diff --git a/src/library/base/man/mat.or.vec.Rd b/src/library/base/man/mat.or.vec.Rd
index ad91702a7c..82f3e21eae 100644
--- a/src/library/base/man/mat.or.vec.Rd
+++ b/src/library/base/man/mat.or.vec.Rd
@@ -13,10 +13,11 @@ mat.or.vec(nr, nc)
   \item{nr, nc}{numbers of rows and columns.}
 }
 \description{
-  \code{mat.or.vec} creates an \code{nr} by \code{nc} zero matrix if
+  \code{mat.or.vec} creates an \code{nr} by \code{nc} zero \link{matrix} if
   \code{nc} is greater than 1, and a zero vector of length \code{nr} if
   \code{nc} equals 1.
 }
+\value{A vector or a matrix filled with 0.}
 \examples{
 mat.or.vec(3, 1)
 mat.or.vec(3, 2)
diff --git a/src/library/base/man/matrix.Rd b/src/library/base/man/matrix.Rd
index 26498b1842..10867fc83c 100644
--- a/src/library/base/man/matrix.Rd
+++ b/src/library/base/man/matrix.Rd
@@ -101,8 +101,12 @@ is.matrix(x)
   \code{\link{data.matrix}}, which attempts to convert to a numeric
   matrix.
 
+
   A matrix is the special case of a two-dimensional \code{\link{array}}.
   \code{\link{inherits}(m, "array")} is true for a \code{matrix} \code{m}.
+
+  \code{\link{mat.or.vec}} for creating numeric vectors or matrices.
+  \code{\link{\%*\%}}, \code{\link{det}} for operations with numeric matrices.
 }
 \examples{
 is.matrix(as.matrix(1:10))
diff --git a/src/library/base/man/regex.Rd b/src/library/base/man/regex.Rd
index aa4eaa40dc..32f9bfd49f 100644
--- a/src/library/base/man/regex.Rd
+++ b/src/library/base/man/regex.Rd
@@ -359,6 +359,8 @@
   \code{\link{glob2rx}}, \code{\link{help.search}}, \code{\link{list.files}},
   \code{\link{ls}}, \code{\link{strsplit}} and \code{\link{agrep}}.
 
+  Examples of regular expressions used by R \code{\link{.standard_regexps}}.
+
   The \href{https://html-preview.github.io/?url=https://raw.githubusercontent.com/laurikari/tre/master/doc/tre-syntax.html}{\I{TRE} regexp syntax}.
 
   The POSIX 1003.2 standard at
diff --git a/src/library/base/man/replace.Rd b/src/library/base/man/replace.Rd
index ff1185634d..b50b7ad3e1 100644
--- a/src/library/base/man/replace.Rd
+++ b/src/library/base/man/replace.Rd
@@ -16,7 +16,7 @@ If necessary, the values in \code{values} are recycled.
 }
 \arguments{
   \item{x}{a vector.}
-  \item{list}{an index vector.}
+  \item{list}{an index \link{vector}.}
   \item{values}{replacement values.}
 }
 \value{
@@ -28,4 +28,16 @@ If necessary, the values in \code{values} are recycled.
 \note{
   \code{x} is unchanged: remember to assign the result.
 }
+\seealso{
+  \link{Extract} to replace in objects. 
+}
+\value{
+  x <- 1:5
+  (y <- replace(x, c(2, 5), c(8, 9)))
+  x # Not modified
+
+   # Works with any vector
+  z <- list(A = "a", B = 2, C = diag(5))
+  replace(z, c(1, 2, 3), list(5, diag(3), "A"))
+}
 \keyword{manip}
diff --git a/src/library/base/man/split.Rd b/src/library/base/man/split.Rd
index c4336f39e2..2e35d3d1c3 100644
--- a/src/library/base/man/split.Rd
+++ b/src/library/base/man/split.Rd
@@ -22,7 +22,7 @@
 split(x, f, drop = FALSE, \dots)
 \method{split}{default}(x, f, drop = FALSE, sep = ".", lex.order = FALSE, \dots)
 
-split(x, f, drop = FALSE, \dots) <- value
+split(x, f, drop = FALSE, \dots) <- values
 unsplit(value, f, drop = FALSE)
 }
 \arguments{
@@ -84,6 +84,9 @@ unsplit(value, f, drop = FALSE)
   \code{\link{cut}} to categorize numeric values.
 
   \code{\link{strsplit}} to split strings.
+
+  \code{\link{asplit}} to split matrices and arrays.
+
 }
 \references{
   \bibshow{R:Becker+Chambers+Wilks:1988}
diff --git a/src/library/base/man/zutils.Rd b/src/library/base/man/zutils.Rd
index a51ca3c6c9..c7e919a578 100644
--- a/src/library/base/man/zutils.Rd
+++ b/src/library/base/man/zutils.Rd
@@ -16,4 +16,7 @@
   \code{valid_package_version} with the obvious meanings.  The regexps
   are not anchored.
 }
+\examples{
+.standard_regexps()
+}
 \keyword{utilities}