diff --git a/man/CalGR.Rd b/man/CalGR.Rd
index 953086d31fde277104ffe31ac35b89fce0fea54c..d3470d9708c41390677f05b8ab4867065c060ad9 100644
--- a/man/CalGR.Rd
+++ b/man/CalGR.Rd
@@ -21,7 +21,7 @@ CalGR(PrepGR, CalCrit = c("NSE", "KGE", "KGE2", "RMSE"),
 
   \item{CalCrit}{[character] name of the objective function (must be one of \code{"NSE"}, \code{"KGE"}, \code{"KGE2"} or \code{"RMSE"})}
 
-  \item{WupPer}{(optional) [character] vector of 2 values to define the beginning and end of the warm-up period [\code{"YYYY-mm-dd"} or \code{"YYYY-mm-dd HH:MM:SS"}]. See details}
+  \item{WupPer}{(optional) [character] vector of 2 values to define the beginning and end of the warm-up period [\code{"YYYY-mm-dd"} or \code{"YYYY-mm-dd HH:MM:SS"}]; [0L] to disable the warm-up period. See details}
 
   \item{CalPer}{[character] vector of 2 values to define the beginning and end of the calibration period [\code{"YYYY-mm-dd"} or \code{"YYYY-mm-dd HH:MM:SS"}]}
 
@@ -53,10 +53,12 @@ airGR
 functions
 }
 
+
 \details{
-\code{WupPer = NULL} indicates that, if available, a period of one year immediately present before the \code{CalPer} period is used. In order to disable the warm up of the model, users have to make sure not to provide data before \code{CalPer} when preparing the data with \code{\link{PrepGR}}.
+\code{WupPer = NULL} indicates that, if available, a period of one year immediately present before the CalPer period is used. \code{WupPer = 0L} allows to disable the warm up of the model.
 }
 
+
 \author{Olivier Delaigue}
 
 
diff --git a/man/SimGR.Rd b/man/SimGR.Rd
index 03a5e48d6aee07f96b9d0b52acf2ec196f254bbb..e19ec637a3b7122824676777e10687b5c922566e 100644
--- a/man/SimGR.Rd
+++ b/man/SimGR.Rd
@@ -25,7 +25,7 @@ SimGR(PrepGR, CalGR = NULL, Param, EffCrit = c("NSE", "KGE", "KGE2", "RMSE"),
 
   \item{EffCrit}{[character] name of the efficiency criterion (must be one of \code{"NSE"}, \code{"KGE"}, \code{"KGE2"} or \code{"RMSE"})}
 
-  \item{WupPer}{(optional) [character] vector of 2 values to define the beginning and end of the warm-up period [\code{"YYYY-mm-dd"} or \code{"YYYY-mm-dd HH:MM:SS"}]}
+  \item{WupPer}{(optional) [character] vector of 2 values to define the beginning and end of the warm-up period [\code{"YYYY-mm-dd"} or \code{"YYYY-mm-dd HH:MM:SS"}]; [0L] to disable the warm-up period. See details}
 
   \item{SimPer}{[character] vector of 2 values to define the beginning and end of the simulation period  [\code{"YYYY-mm-dd"} or \code{"YYYY-mm-dd HH:MM:SS"}]}
 
@@ -63,8 +63,11 @@ functions
 \details{
 The user can customize the parameters with the \code{Param} argument.
 The user can also use the parameters resulting from a calibration. In this case, it is necessary to use the \code{\link{CalGR}} function.
+\cr\cr
+\code{WupPer = NULL} indicates that, if available, a period of one year immediately present before the CalPer period is used. \code{WupPer = 0L} allows to disable the warm up of the model.
 }
 
+
 \author{Olivier Delaigue}