diff --git a/doc/NEWS.Rd b/doc/NEWS.Rd
index 4baa54dbd3..74e3c84861 100644
--- a/doc/NEWS.Rd
+++ b/doc/NEWS.Rd
@@ -474,6 +474,9 @@
       \command{clang} 17--19.  (\I{LLVM} \command{clang} 18 and 19 objected
       to apparently valid code using attributes accepted by all the
       other compilers.)
+
+      It can be installed with the upcoming (at the time of writing)
+      \command{gcc} 15, which defaults to C23.
     }
   }
 
diff --git a/doc/manual/R-admin.texi b/doc/manual/R-admin.texi
index a80608ae7b..96684abda7 100644
--- a/doc/manual/R-admin.texi
+++ b/doc/manual/R-admin.texi
@@ -1080,7 +1080,8 @@ if you want to specify a non-default standard use something like
 
 Compiling @R{} requires C99 or later: C11 and C17 are minor updates, but
 the substantial update `C23' (finally published in October 2024) is also
-supported for current versions of GCC and @command{clang}.
+supported for current versions of GCC and @command{clang}.  The upcoming
+GCC@tie{}15 is expected to default to C23.
 
 As from @R{} 4.3.0 there is support for packages to indicate their
 preferred C version.  Macros @code{CC17}, @code{C17FLAGS}, @code{CC23}