diff --git a/NAMESPACE b/NAMESPACE
index 38e1aa3..ae356e5 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -7,6 +7,7 @@ export(CMD_Render)
 export(CMD_Rscript)
 export(Cmd)
 export(Comment)
+export(Copy)
 export(Entrypoint)
 export(Expose)
 export(Label)
diff --git a/R/Class-Copy.R b/R/Class-Copy.R
index 29f8d25..c3c6a86 100644
--- a/R/Class-Copy.R
+++ b/R/Class-Copy.R
@@ -13,6 +13,7 @@
 #' @family instruction classes
 #' @examples
 #' #no example yet
+#' Copy("here", "/here")
 setClass("Copy",
          slots = list(src = "character", dest = "character"),
          contains = "Instruction")
@@ -26,6 +27,7 @@ setClass("Copy",
 #' @param addTrailingSlashes (boolean) add trailing slashes to the given paths if the source is an existing directory
 #'
 #' @return the object
+#' @export
 #' @importFrom fs dir_exists
 #' @importFrom stringr str_detect
 Copy <- function(src, dest, addTrailingSlashes = TRUE) {
diff --git a/R/utility-functions.R b/R/utility-functions.R
index dcf7d04..a063e08 100644
--- a/R/utility-functions.R
+++ b/R/utility-functions.R
@@ -190,10 +190,17 @@ getRVersionTag <- function(from, default = paste(R.Version()$major, R.Version()$
   } else if (inherits(from, "description")) {
     # get R: stringr::str_extract(string = "methods, R (1.2.3,test), test (9.9)", pattern = "R( \\(.*?\\))?")
     # get version: stringr::str_extract(string = "R (1.2.3)", pattern = "(?<=\\().+?(?=\\))")
-    r_depends <- stringr::str_extract(string = from$get_field("Depends"), pattern = "R( \\(.*?\\))?")
+    r_depends <- stringr::str_extract(string = from$get_field("Depends", default = NULL), pattern = "R( \\(.*?\\))?")
     r_version <- stringr::str_extract(string = stringr::str_extract(string = r_depends,
                                                                     pattern = "(?<=\\().+?(?=\\))"),
                                       pattern = "(\\d).*") # everything after the first digit
+    if (length(r_version) == 0 || nchar(n_version) == 0) {
+      warning(paste0("No R version in DESCRIPTION file, using sessionInfo(). ",
+              "Set Depends: R (>= VERSION) to override"))
+      temp_from <- sessionInfo()
+      r_version <- paste(temp_from$R.version$major, temp_from$R.version$minor, sep = ".")
+      futile.logger::flog.debug("Got R version from sessionInfo: %s", r_version)
+    }
   } else if (!is.null(from)
              && !is.expression(from)
              && !is.na(from)
diff --git a/man/Copy-class.Rd b/man/Copy-class.Rd
index 7772447..ebd235c 100644
--- a/man/Copy-class.Rd
+++ b/man/Copy-class.Rd
@@ -17,6 +17,7 @@ S4 Class representing a COPY-instruction
 }
 \examples{
 #no example yet
+Copy("here", "/here")
 }
 \seealso{
 Other instruction classes: