diff --git a/R/derive_merged.R b/R/derive_merged.R
index aa36bbe947..7fbe55ab61 100644
--- a/R/derive_merged.R
+++ b/R/derive_merged.R
@@ -94,8 +94,8 @@
 #'
 #'   If the argument is specified (e.g., `exist_flag = FLAG`), the specified
 #'   variable (e.g., `FLAG`) is added to the input dataset. This variable will
-#'   be `TRUE` for all selected records from `dataset_add` which are merged into
-#'   the input dataset, and `NA` otherwise.
+#'   be the value provided in `true_value` for all selected records from `dataset_add`
+#'   which are merged into the input dataset, and the value provided in `false_value` otherwise.
 #'
 #'   *Permitted Values*: Variable name
 #'
diff --git a/man/derive_vars_joined.Rd b/man/derive_vars_joined.Rd
index e4d5d136d3..5092e89ab8 100644
--- a/man/derive_vars_joined.Rd
+++ b/man/derive_vars_joined.Rd
@@ -129,8 +129,8 @@ If the \code{order} argument is not specified, the \code{mode} argument is ignor
 
 If the argument is specified (e.g., \code{exist_flag = FLAG}), the specified
 variable (e.g., \code{FLAG}) is added to the input dataset. This variable will
-be \code{TRUE} for all selected records from \code{dataset_add} which are merged into
-the input dataset, and \code{NA} otherwise.
+be the value provided in \code{true_value} for all selected records from \code{dataset_add}
+which are merged into the input dataset, and the value provided in \code{false_value} otherwise.
 
 \emph{Permitted Values}: Variable name}
 
diff --git a/man/derive_vars_merged.Rd b/man/derive_vars_merged.Rd
index 2e04872e3c..d198cd0ca8 100644
--- a/man/derive_vars_merged.Rd
+++ b/man/derive_vars_merged.Rd
@@ -110,8 +110,8 @@ the input dataset, and \code{NA} otherwise.
 
 If the argument is specified (e.g., \code{exist_flag = FLAG}), the specified
 variable (e.g., \code{FLAG}) is added to the input dataset. This variable will
-be \code{TRUE} for all selected records from \code{dataset_add} which are merged into
-the input dataset, and \code{NA} otherwise.
+be the value provided in \code{true_value} for all selected records from \code{dataset_add}
+which are merged into the input dataset, and the value provided in \code{false_value} otherwise.
 
 \emph{Permitted Values}: Variable name}