diff --git a/R/RunModel.GRiwrmOutputsModel.R b/R/RunModel.GRiwrmOutputsModel.R
index cc4936ce0d8a2452ddc3a482b66cced43cb6c861..382d66c408f0a9bec27d2e6523c217a593f82432 100644
--- a/R/RunModel.GRiwrmOutputsModel.R
+++ b/R/RunModel.GRiwrmOutputsModel.R
@@ -31,6 +31,8 @@
 #' @param Qrelease (optional) [matrix] or [data.frame] of [numeric] containing
 #'        release flows by nodes using the model `RunModel_Reservoir` \[m3 per
 #'        time step\]. See details
+#' @param merge_outputs [logical] Merge simulation outputs with the one provided
+#' in argument `x`
 #' @param ... Further arguments for compatibility with S3 methods
 #'
 #' @inherit RunModel.GRiwrmInputsModel return
diff --git a/man/RunModel.GRiwrmOutputsModel.Rd b/man/RunModel.GRiwrmOutputsModel.Rd
index 66eb328ab8671730563a7d360187298600b9763d..5dd80327f1370caa39943e2d8b154f0af88c6d6f 100644
--- a/man/RunModel.GRiwrmOutputsModel.Rd
+++ b/man/RunModel.GRiwrmOutputsModel.Rd
@@ -45,6 +45,9 @@ minimum flows to let downstream of a node with a Diversion [m3 per
 time step]. Default is zero. Column names correspond to node IDs.
 See details}
 
+\item{merge_outputs}{\link{logical} Merge simulation outputs with the one provided
+in argument \code{x}}
+
 \item{...}{Further arguments for compatibility with S3 methods}
 }
 \value{