diff --git a/R/uniquePresent.R b/R/uniquePresent.R
index 029a722f..0957b6c5 100644
--- a/R/uniquePresent.R
+++ b/R/uniquePresent.R
@@ -13,7 +13,7 @@
 ##'     result is a single unique value (e.g., within subjects). A
 ##'     typical use is carrying subject-level covariates from one data
 ##'     set to another in a longitudinal analysis.
-##' @param a vector of same class as `x`
+##' @return a vector of same class as `x`
 ##' @export
 uniquePresent <- function(x,req.n1=TRUE,na.pattern){
     if(missing(na.pattern)) na.pattern <- "^ *$"