diff --git a/R/SeriesAggreg.R b/R/SeriesAggreg.R
index 599c412865b62b5c48a60df7f744e72ad19ec79a..62bb75f7aecc51f18d1b9d85178f7c98e28e9282 100644
--- a/R/SeriesAggreg.R
+++ b/R/SeriesAggreg.R
@@ -1,4 +1,4 @@
-SeriesAggreg_new <- function(TabSeries, TimeFormat, NewTimeFormat, ConvertFun, YearFirstMonth = 01, TimeLag = 0, verbose = TRUE){
+SeriesAggreg_new <- function(TabSeries, TimeFormat, NewTimeFormat, ConvertFun, YearFirstMonth = 1, TimeLag = 0, verbose = TRUE){
   
   
   ##_Arguments_check
diff --git a/man/SeriesAggreg.Rd b/man/SeriesAggreg.Rd
index 41c79f3c86efc42a62816840b4ee6fe6ff24a4b7..4e374374153eedffb487096f49bb265307db8164 100644
--- a/man/SeriesAggreg.Rd
+++ b/man/SeriesAggreg.Rd
@@ -4,7 +4,7 @@
 \title{Conversion of time series to another time step (aggregation only)}
 \usage{
 SeriesAggreg(TabSeries, TimeFormat, NewTimeFormat, ConvertFun,
-  YearFirstMonth = 1, verbose = TRUE)
+  YearFirstMonth = 1, TimeLag = 0, verbose = TRUE)
 }
 \arguments{
 \item{TabSeries}{[POSIXlt+numeric] dataframe containing the vector of dates and the time series values}