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diff --git a/pkg/R/F_Zero.R b/pkg/R/F_Zero.R
index ff6eb52..21e6e00 100644
--- a/pkg/R/F_Zero.R
+++ b/pkg/R/F_Zero.R
@@ -1,13 +1,18 @@
-#' @include Forecaster.R
-#'
 #' Zero Forecaster
 #'
-#' Return 0 (and then adjust). Inherits \code{\link{Forecaster}}
+#' Flat prediction: always forecast a serie of zeros (adjusted by 'pjump' function).
+#'
+#' @usage # ZeroForecaster$new(pjump)
+#'
+#' @docType class
+#' @format R6 class, inherits Forecaster
+#' @aliases F_Zero
+#'
 ZeroForecaster = R6::R6Class("ZeroForecaster",
-	inherit = "Forecaster",
+	inherit = Forecaster,
 
 	public = list(
-		predictShape = function(today, memory, horizon, ...)
-			rep(0., horizon)
+		predictShape = function(data, today, memory, predict_from, horizon, ...)
+			rep(0, (horizon-predict_from+1))
 	)
 )