diff --git a/R/add_description.R b/R/add_description.R
new file mode 100644
index 00000000..04c5b7db
--- /dev/null
+++ b/R/add_description.R
@@ -0,0 +1,33 @@
+add_description <- function(old_schema, descriptions) {
+  schema <- old_schema
+  schema$fields <- purrr::imap(
+    schema$fields,
+    ~ c(.x, description = descriptions[.y])
+  )
+  return(schema)
+}
+
+
+edit_fields <- function(old_schema, metadata_name, metadata) {
+  field_names <- names(metadata)
+  schema <- old_schema
+  for (name in field_names) {
+    schema <- edit_field_from_name(schema, name, metadata_name, metadata[[name]])
+  }
+  return(schema)
+}
+
+
+edit_field_from_name <- function(old_schema, field_name, metadata_name, metadata) {
+  field_names <- get_field_names(old_schema)
+  schema <- old_schema
+  names(schema$fields) <- field_names
+  schema$fields[[field_name]][metadata_name] <- metadata
+  names(schema$fields) <- NULL
+  return(schema)
+}
+
+
+get_field_names <- function(old_schema) {
+  purrr::map_chr(old_schema$fields, ~ .$name)
+}
diff --git a/tests/testthat/test-add_description.R b/tests/testthat/test-add_description.R
new file mode 100644
index 00000000..2e252e5a
--- /dev/null
+++ b/tests/testthat/test-add_description.R
@@ -0,0 +1,115 @@
+.add_field_basic_metadata <- function(name, type, description) {
+  list(
+    "name" = name,
+    "type" = type,
+    "description" = description
+  )
+}
+
+# Create a Data Package and add the "iris" data frame as a resource
+my_package <- create_package() %>%
+  add_resource(resource_name = "iris", data = iris)
+
+
+iris_schema <- my_package %>%
+  get_schema("iris")
+
+test_that("add_description(): Iris example", {
+  descriptions <- c(
+    "Sepal length in cm.",
+    "Sepal width in cm.",
+    "Pedal length in cm.",
+    "Pedal width in cm.",
+    "Iris species."
+  )
+  expected <- list("fields" = list(
+    .add_field_basic_metadata("Sepal.Length", "number", descriptions[1]),
+    .add_field_basic_metadata("Sepal.Width", "number", descriptions[2]),
+    .add_field_basic_metadata("Petal.Length", "number", descriptions[3]),
+    .add_field_basic_metadata("Petal.Width", "number", descriptions[4]),
+    list(
+      "name" = "Species",
+      "type" = "string",
+      "constraints" = list("enum" = c("setosa", "versicolor", "virginica")),
+      "description" = descriptions[5]
+    )
+  ))
+  obtained <- iris_schema |>
+    add_description(descriptions)
+  expect_equal(obtained, expected)
+})
+
+test_that("edit_fields(): Iris example", {
+  descriptions <- c(
+    "Sepal length in cm.",
+    "Sepal width in cm.",
+    "Pedal length in cm.",
+    "Pedal width in cm.",
+    "Iris species."
+  )
+  field_names <- c(
+    "Sepal.Length",
+    "Sepal.Width",
+    "Petal.Length",
+    "Petal.Width",
+    "Species"
+  )
+  expected <- list("fields" = list(
+    .add_field_basic_metadata("Sepal.Length", "number", descriptions[1]),
+    .add_field_basic_metadata("Sepal.Width", "number", descriptions[2]),
+    .add_field_basic_metadata("Petal.Length", "number", descriptions[3]),
+    .add_field_basic_metadata("Petal.Width", "number", descriptions[4]),
+    list(
+      "name" = "Species",
+      "type" = "string",
+      "constraints" = list("enum" = c("setosa", "versicolor", "virginica")),
+      "description" = descriptions[5]
+    )
+  ))
+  names(descriptions) <- field_names
+  obtained <- iris_schema |> edit_fields(
+    "description",
+    descriptions
+  )
+  expect_equal(obtained, expected)
+})
+
+
+test_that("edit_field_from_name()", {
+  description <- "Sepal length in cm."
+  expected <- list("fields" = list(
+    .add_field_basic_metadata("Sepal.Length", "number", description),
+    list(
+      "name" = "Sepal.Width",
+      "type" = "number"
+    ),
+    list(
+      "name" = "Petal.Length",
+      "type" = "number"
+    ),
+    list(
+      "name" = "Petal.Width",
+      "type" = "number"
+    ),
+    list(
+      "name" = "Species",
+      "type" = "string",
+      "constraints" = list("enum" = c("setosa", "versicolor", "virginica"))
+    )
+  ))
+  obtained <- iris_schema |> edit_field_from_name("Sepal.Length", "description", description)
+  expect_equal(obtained, expected)
+})
+
+
+test_that("get_field_names", {
+  expected_names <- c(
+    "Sepal.Length",
+    "Sepal.Width",
+    "Petal.Length",
+    "Petal.Width",
+    "Species"
+  )
+  obtained_names <- get_field_names(iris_schema)
+  expect_equal(expected_names, obtained_names)
+})