diff --git a/DESCRIPTION b/DESCRIPTION
index a1bcbd96..1d67a876 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -10,7 +10,8 @@ Authors@R: c(
     person("Posit Software, PBC", role = c("cph", "fnd"))
   )
 Description: Defines a set of generics that provide a low-level
-    implementer's interface for dplyr's high-level user interface.
+    implementer's interface for the high-level user interface of
+    'dplyr'.
 License: MIT + file LICENSE
 URL: https://github.com/krlmlr/duckplyr, https://krlmlr.github.io/duckplyr/
 BugReports: https://github.com/krlmlr/duckplyr/issues
diff --git a/R/relational-expr.R b/R/relational-expr.R
index 1696ffb2..3ef65294 100644
--- a/R/relational-expr.R
+++ b/R/relational-expr.R
@@ -13,6 +13,7 @@
 #' @param class Classes added in front of the `"relational_relexpr"` base class.
 #'
 #' @name expr
+#' @return an object of class `"relational_relexpr"`
 #' @export
 #' @examples
 #' relexpr_set_alias(alias = "my_predicate",
@@ -35,6 +36,7 @@ new_relexpr <- function(x, class = NULL) {
 #' @param rel The name of the relation to reference.
 #' @param alias An alias for the new expression.
 #' @rdname expr
+#' @return an object of class `"relational_relexpr"`
 #' @export
 relexpr_reference <- function(name, rel = NULL, alias = NULL) {
   stopifnot(is_string(name))
@@ -49,6 +51,7 @@ relexpr_reference <- function(name, rel = NULL, alias = NULL) {
 #'
 #' @param val The value to use in the constant expression.
 #' @rdname expr
+#' @return an object of class `"relational_relexpr"`
 #' @export
 relexpr_constant <- function(val, alias = NULL) {
   stopifnot(length(val) == 1)
@@ -63,6 +66,7 @@ relexpr_constant <- function(val, alias = NULL) {
 #'
 #' @param args Function arguments, a list of `expr` objects.
 #' @rdname expr
+#' @return an object of class `"relational_relexpr"`
 #' @export
 relexpr_function <- function(name, args, alias = NULL) {
   stopifnot(is_string(name))
@@ -77,6 +81,7 @@ relexpr_function <- function(name, args, alias = NULL) {
 #'
 #' @param expr An `expr` object.
 #' @rdname expr
+#' @return an object of class `"relational_relexpr"`
 #' @export
 relexpr_set_alias <- function(expr, alias = NULL) {
   stopifnot(inherits(expr, "relational_relexpr"))
diff --git a/man/expr.Rd b/man/expr.Rd
index 230ef96c..05cdfbfe 100644
--- a/man/expr.Rd
+++ b/man/expr.Rd
@@ -36,6 +36,17 @@ relexpr_set_alias(expr, alias = NULL)
 
 \item{expr}{An \code{expr} object.}
 }
+\value{
+an object of class \code{"relational_relexpr"}
+
+an object of class \code{"relational_relexpr"}
+
+an object of class \code{"relational_relexpr"}
+
+an object of class \code{"relational_relexpr"}
+
+an object of class \code{"relational_relexpr"}
+}
 \description{
 These functions provide a backend-agnostic way to construct expression trees
 built of column references, constants, and functions.