diff --git a/R/engine.R b/R/engine.R
index 4da4ba1..64a0987 100644
--- a/R/engine.R
+++ b/R/engine.R
@@ -21,6 +21,7 @@
 #'
 #'  See [base64 crate](https://docs.rs/base64/latest/base64/engine/general_purpose/index.html#constants) for more.
 #'
+#' @return an object of class `engine`.
 #' @export
 #' @examples
 #' engine()
diff --git a/man/engine.Rd b/man/engine.Rd
index 8f556d6..58fe294 100644
--- a/man/engine.Rd
+++ b/man/engine.Rd
@@ -19,6 +19,9 @@ See details for more.}
 \item{.config}{an object of class \code{engine_config} as created with
 \code{\link[=new_config]{new_config()}}}
 }
+\value{
+an object of class \code{engine}.
+}
 \description{
 Create an encoding engine
 }