diff --git a/doc/NEWS.Rd b/doc/NEWS.Rd
index 756cc2967f..dd03bd7ca8 100644
--- a/doc/NEWS.Rd
+++ b/doc/NEWS.Rd
@@ -260,7 +260,7 @@
       \item Source installs now report the package version in the log.
 
       \item There is preliminary support for C++26 in GCC >= 14, Apple
-      clang >= 16 and LLVM clang >= 17.
+      clang >= 16 and \I{LLVM} clang >= 17.
     }
   }
 
@@ -415,7 +415,7 @@
       When building \R itself (\file{doc/NEWS.pdf} and base vignettes)
       or package manuals using \command{R CMD Rd2pdf}, it is ensured
       that this \R's \file{Rd.sty} takes precedence over any other
-      (incompatible) versions in default \dQuote{texmf trees}.
+      (incompatible) versions in default \I{\dQuote{texmf trees}}.
 
       \item \code{tools::Rd2latex()} no longer outputs an
       \samp{\\inputencoding{utf8}} line by default;
diff --git a/doc/manual/R-exts.texi b/doc/manual/R-exts.texi
index 0207fbe18f..c9c1015da6 100644
--- a/doc/manual/R-exts.texi
+++ b/doc/manual/R-exts.texi
@@ -6575,7 +6575,7 @@ Another build for Windows which may be sufficiently compatible with
 @node C23 changes
 @subsubsection C23 changes
 
-Thw C23 standard was finally published in Oct 2024, by which time it had
+The C23 standard was finally published in Oct 2024, by which time it had
 been widely implemented for a least a couple of years.  It will become
 the default of GCC 15, and @R{} will default to it if available from
 @R{} 4.5.0.