diff --git a/lib/layout-helpers.sh b/lib/layout-helpers.sh
index bef4955..cf862f9 100644
--- a/lib/layout-helpers.sh
+++ b/lib/layout-helpers.sh
@@ -105,20 +105,42 @@ select_pane() {
   tmuxifier-tmux select-pane -t "$session:$window.$1"
 }
 
+# Balance windows vertically with the "even-vertical" layout.
+#
+# Arguments:
+#   - $1: (optional) Window ID or name to operate on.
+#
 balance_windows_vertical() {
-  tmuxifier-tmux select-layout even-vertical
+  tmuxifier-tmux select-layout -t "$session:${1:-$window}" even-vertical
 }
 
+# Balance windows horizontally with the "even-horizontal" layout.
+#
+# Arguments:
+#   - $1: (optional) Window ID or name to operate on.
+#
 balance_windows_horizontal() {
-  tmuxifier-tmux select-layout even-horizontal
+  tmuxifier-tmux select-layout -t "$session:${1:-$window}" even-horizontal
 }
 
+# Turn on synchronize-panes in a window.
+#
+# Arguments:
+#   - $1: (optional) Window ID or name to operate on.
+#
 synchronize_on() {
-  tmuxifier-tmux set-window-option synchronize-panes on
+  tmuxifier-tmux set-window-option -t "$session:${1:-$window}" \
+                 synchronize-panes on
 }
 
+# Turn off synchronize-panes in a window.
+#
+# Arguments:
+#   - $1: (optional) Window ID or name to operate on.
+#
 synchronize_off() {
-  tmuxifier-tmux set-window-option synchronize-panes off
+  tmuxifier-tmux set-window-option -t "$session:${1:-$window}" \
+                 synchronize-panes off
 }
 
 # Send/paste keys to the currently active pane/window.