diff --git a/R/data.R b/R/data.R
index da037e4..cd2082f 100644
--- a/R/data.R
+++ b/R/data.R
@@ -5,7 +5,7 @@
 #' Low levels of FEV1 may indicate chronic obstructive pulmonary disease (COPD).
 #' @format A `tibble` with 800 rows and 7 variables:
 #'
-#'   - `USUBJID`: price, in US dollars.
+#'   - `USUBJID`: unique subject identifier.
 #'   - `AVISIT`: visit number.
 #'   - `ARMCD`: treatment, `TRT` or `PBO`.
 #'   - `RACE`: 3-category race.
diff --git a/man/fev_data.Rd b/man/fev_data.Rd
index 6747c07..c35d5e3 100644
--- a/man/fev_data.Rd
+++ b/man/fev_data.Rd
@@ -7,7 +7,7 @@
 \format{
 A \code{tibble} with 800 rows and 7 variables:
 \itemize{
-\item \code{USUBJID}: price, in US dollars.
+\item \code{USUBJID}: unique subject identifier.
 \item \code{AVISIT}: visit number.
 \item \code{ARMCD}: treatment, \code{TRT} or \code{PBO}.
 \item \code{RACE}: 3-category race.