diff --git a/R/data.R b/R/data.R
index 2291958..e241be3 100644
--- a/R/data.R
+++ b/R/data.R
@@ -5,7 +5,8 @@
 #'
 #' @format A data frame with five variables: \code{year}, \code{sex},
 #'   \code{name}, \code{n} and \code{prop} (\code{n} divided by total number
-#'   of applicants in that year).
+#'   of applicants in that year, which means proportions are of people of
+#'   that gender with that name born in that year).
 "babynames"
 
 #' Applicants.
diff --git a/man/babynames.Rd b/man/babynames.Rd
index da53a27..3440834 100644
--- a/man/babynames.Rd
+++ b/man/babynames.Rd
@@ -6,7 +6,8 @@
 \title{Baby names.}
 \format{A data frame with five variables: \code{year}, \code{sex},
   \code{name}, \code{n} and \code{prop} (\code{n} divided by total number
-  of applicants in that year).}
+  of applicants in that year, which means proportions are of people of
+  that gender with that name born in that year).}
 \usage{
 babynames
 }