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-rw-r--r--R/estpoly.R3
1 files changed, 3 insertions, 0 deletions
diff --git a/R/estpoly.R b/R/estpoly.R
index 6589291..ed43671 100644
--- a/R/estpoly.R
+++ b/R/estpoly.R
@@ -136,6 +136,9 @@ residplot <- function(model,newdata=NULL){
#' \cr
#' The data is expected to have no offsets or trends. They can be removed
#' using the \code{\link{detrend}} function.
+#' \cr
+#' To estimate finite impulse response(\code{FIR}) models, specify the first
+#' order to be zero.
#'
#' @return
#' An object of class \code{estpoly} containing the following elements: