diff --git a/R/split.R b/R/deprec-split.R
similarity index 87%
rename from R/split.R
rename to R/deprec-split.R
index a0fab294..ed140f8d 100644
--- a/R/split.R
+++ b/R/deprec-split.R
@@ -1,4 +1,7 @@
-#' Split xpt file output
+#' Deprecated - Split xpt file output
+#'
+#' @description
+#' `r lifecycle::badge("deprecated")`
 #'
 #' Per the FDA Study Data Technical Conformance
 #' Guide(https://www.fda.gov/media/88173/download) section 3.3.2, dataset files
@@ -18,8 +21,8 @@
 #'   knows how to split the data frame.
 #'
 #'
-#' @export
 #'
+#' @export
 #' @examples
 #'
 #' adlb <- data.frame(
@@ -29,7 +32,9 @@
 #'
 #' adlb <- xportr_split(adlb, "LBCAT")
 xportr_split <- function(.df, split_by = NULL) {
+  .Deprecated("xportr_write(max_size_gb = ..")
   attr(.df, "_xportr.split_by_") <- split_by
-
   return(.df)
 }
+
+#' @rdname xportr_split-deprecated
diff --git a/man/xportr_split.Rd b/man/xportr_split.Rd
index 34223a5f..79d76f1d 100644
--- a/man/xportr_split.Rd
+++ b/man/xportr_split.Rd
@@ -1,8 +1,8 @@
 % Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/split.R
+% Please edit documentation in R/deprec-split.R
 \name{xportr_split}
 \alias{xportr_split}
-\title{Split xpt file output}
+\title{Deprecated - Split xpt file output}
 \usage{
 xportr_split(.df, split_by = NULL)
 }
@@ -16,13 +16,14 @@ A data frame with an additional attribute added so \code{xportr_write()}
 knows how to split the data frame.
 }
 \description{
+\ifelse{html}{\href{https://lifecycle.r-lib.org/articles/stages.html#deprecated}{\figure{lifecycle-deprecated.svg}{options: alt='[Deprecated]'}}}{\strong{[Deprecated]}}
+
 Per the FDA Study Data Technical Conformance
 Guide(https://www.fda.gov/media/88173/download) section 3.3.2, dataset files
 sizes shouldn't exceed 5 GB. If datasets are large enough, they should be
 split based on a variable. For example, laboratory readings in \code{ADLB} can be
 split by \code{LBCAT} to split up hematology and chemistry data.
-}
-\details{
+
 This function will tell \code{xportr_write()} to split the data frame based on the
 variable passed in \code{split_by}. When written, the file name will be prepended
 with a number for uniqueness. These files should be noted in the Reviewer Guides per
diff --git a/tests/testthat/test-deprecation.R b/tests/testthat/test-deprecation.R
index 23d7c55a..59d49ff7 100644
--- a/tests/testthat/test-deprecation.R
+++ b/tests/testthat/test-deprecation.R
@@ -98,3 +98,16 @@ test_that(
     expect_error(xportr_type(df, metacore = df_meta))
   }
 )
+
+## Test 7: xportr_split: using deprecated function gives a warning----
+test_that(
+  "deprecation xportr_split: using deprecated function gives a warning",
+  {
+    adlb <- data.frame(
+      USUBJID = c(1001, 1002, 1003),
+      LBCAT = c("HEMATOLOGY", "HEMATOLOGY", "CHEMISTRY")
+    )
+
+    expect_warning(adlb <- xportr_split(adlb, "LBCAT"))
+  }
+)