diff --git a/doc/NEWS.Rd b/doc/NEWS.Rd
index 035ddb8630..b0a0cf26cc 100644
--- a/doc/NEWS.Rd
+++ b/doc/NEWS.Rd
@@ -346,6 +346,10 @@
       If there were a platform which used an underlying type of a
       different size this would be an ABI-breaking change (but we are
       unaware of any such platform).
+
+      \item There is a new function \code{asRboolean}, a variannt of
+      \code{asLogical} more suitable to converting logical arguments to
+      \code{Rboolean}.
     }
   }
 
diff --git a/doc/manual/R-exts.texi b/doc/manual/R-exts.texi
index 53d359ffaa..ad1342a5c4 100644
--- a/doc/manual/R-exts.texi
+++ b/doc/manual/R-exts.texi
@@ -13176,11 +13176,19 @@ failed.  There are also @code{Rf_asInteger}, @code{Rf_asReal} and
 @code{Rf_asComplex}.  The function @code{Rf_asChar} returns a @code{CHARSXP}.
 All of these functions ignore any elements of an input vector after the
 first.
+
+@code{Rf_aaRboolean} is a stricter version of @code{Rf_asLogical}
+introduced in @R{}@tie{}4.5.0.  It returns type @code{Rboolean} and
+gives an error for an input of length other than one, and for
+coercion failure.
+
+but gives an weeo
 @apifun Rf_asInteger
 @apifun Rf_asLogical
 @apifun Rf_asReal
 @apifun Rf_asComplex
 @apifun Rf_asChar
+@apifun Rf_asRboolean
 The function @code{Rf_asCharacterFactor} converts a factor to a character
 vector.
 @apifun Rf_asCharacterFactor
diff --git a/src/include/Rinternals.h b/src/include/Rinternals.h
index 3fb375b916..9cf609d4ab 100644
--- a/src/include/Rinternals.h
+++ b/src/include/Rinternals.h
@@ -487,6 +487,7 @@ int Rf_asLogical(SEXP x);
 int Rf_asInteger(SEXP x);
 double Rf_asReal(SEXP x);
 Rcomplex Rf_asComplex(SEXP x);
+Rboolean Rf_asRboolean(SEXP x);
 
 
 // also included in R_ext/Rallocators.h
@@ -900,6 +901,7 @@ void R_orderVector1(int *indx, int n, SEXP x,       Rboolean nalast, Rboolean de
 #define asInteger		Rf_asInteger
 #define asLogical		Rf_asLogical
 #define asLogical2		Rf_asLogical2
+#define asRboolean		Rf_asRboolean
 #define asReal			Rf_asReal
 #define asS4			Rf_asS4
 #define charIsASCII		Rf_charIsASCII