diff --git a/DESCRIPTION b/DESCRIPTION
index 9de8240..e958ad6 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: mse
 Title: Tools for Running Management Strategy Evaluations using FLR
-Version: 2.4.8.9011
+Version: 2.4.9
 Authors@R: c(person(given = "Iago", family = "Mosqueira",
   role = c("aut", "cre"), email = "iago.mosqueira@wur.nl"), 
   person("Ernesto", "Jardim", email = "ernesto.jardim@gmail.com",
diff --git a/NAMESPACE b/NAMESPACE
index 76431c4..5c945f0 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -126,6 +126,7 @@ exportClasses(
 
 exportMethods(
   "[",
+  "append",
   "args",
   "args<-",
   "biol",
diff --git a/NEWS.md b/NEWS.md
index 5ab8895..ae2d4d5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,9 @@
+# mse 2.5.0
+
+## NEW FEATURES
+
+- `append(FLombf, FLombf, after)` method to join two operating models at a year boundary.
+
 # mse 2.4.9
 
 ## BUG FIXES
diff --git a/R/FLombf-class.R b/R/FLombf-class.R
index 94dbed3..545b5e4 100644
--- a/R/FLombf-class.R
+++ b/R/FLombf-class.R
@@ -864,6 +864,60 @@ setMethod("combine", signature(x = "FLombf", y = "FLombf"), function(x, y, ...){
 })
 # }}}
 
+# append {{{
+
+#' Append two FLombf objects along the year dimension
+#'
+#' Joins two \code{FLombf} objects along the year axis: the first object is
+#' windowed to \code{after}, and the second from \code{after + 1} to its last
+#' year. The two windowed pieces are then combined using \code{FLCore::append}
+#' on the underlying \code{FLBiols} and \code{FLFisheries} slots.
+#'
+#' @param x An \code{FLombf} object, used up to year \code{after}.
+#' @param values An \code{FLombf} object, used from year \code{after + 1}.
+#' @param after Integer year. The last year taken from \code{x}. Defaults to
+#'   the last year of \code{x}.
+#'
+#' @return A new \code{FLombf} object spanning the years of \code{x} up to
+#'   \code{after} joined with the years of \code{values} from \code{after + 1}.
+#'
+#' @examples
+#' # Split an FLombf at year 2020 and re-join
+#' om1 <- window(om, end=2020)
+#' om2 <- window(om, start=2021)
+#' om3 <- append(om1, om2, after=2020)
+#'
+#' @rdname FLombf-class
+#' @aliases append,FLombf,FLombf-method
+
+setMethod("append", signature(x="FLombf", values="FLombf"),
+  function(x, values, after=dims(x)$maxyear) {
+
+    after <- as.integer(after)
+
+    # WINDOW x up to 'after'
+    x <- window(x, end=after)
+
+    # WINDOW values from 'after + 1'
+    values <- window(values, start=after + 1L)
+
+    # APPEND biols
+    biols(x) <- FLBiols(Map(append, x=biols(x), values=biols(values)))
+
+    # APPEND fisheries: each FLFishery, then each FLCatch within
+    fisheries(x) <- FLFisheries(Map(function(fx, fv) {
+      # APPEND the FLFishery-level slots (effort, etc.)
+      out <- append(fx, fv)
+      # APPEND every FLCatch within the fishery
+      out@.Data <- Map(append, x=fx@.Data, values=fv@.Data)
+      names(out) <- names(fx)
+      return(out)
+    }, fx=fisheries(x), fv=fisheries(values)))
+
+    return(x)
+  }
+) # }}}
+
 # deviances {{{
 
 setMethod("deviances", signature(object="FLombf"),
diff --git a/README.md b/README.md
index c76b1a3..b430cc2 100644
--- a/README.md
+++ b/README.md
@@ -33,5 +33,5 @@ You are welcome to:
 
 - Submit suggestions and bug-reports at: <https://github.com/flr/mse/issues>
 - Send a pull request on: <https://github.com/flr/mse/>
-- Authors: Iago Mosqueira, WUR. Ernesto Jardim, IPMA.
+- Authors: Iago Mosqueira, WMR. Ernesto Jardim, IPMA.
 - Maintainer: Iago Mosqueira, WMR.