diff --git a/README.md b/README.md
index 0b1dafc..11126cc 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,7 @@ cargo install ctrlg
 ### With Installer Script
 
 Do not run as root or with `sudo`, the script will ask for `sudo` if needed.
+
 ```sh
 bash -c 'bash <(curl --proto "=https" --tlsv1.2 -sSf https://raw.githubusercontent.com/mrjones2014/ctrlg/master/install.bash)'
 ```
@@ -79,6 +80,10 @@ appear in a `tmux` floating window, and specify the window size, with `$CTRLG_TM
 `$CTRLG_TMUX_POPUP_ARGS`, respectively. `$CTRLG_TMUX_POPUP_ARGS` can be any window positioning
 or sizing arguments accepted by `tmux popup`. `$CTRLG_TMUX_POPUP_ARGS` defaults to `-w 75% -h 75%`.
 
+You can also define a hook function to send the `cd` command to additional `tmux` panes not in the
+current window. The function must return a list of `tmux` pane IDs. The hook function is
+`_ctrlg_get_related_panes`.
+
 ### Fish
 
 ```fish
diff --git a/src/commands/shell/ctrlg.bash b/src/commands/shell/ctrlg.bash
index b1b88fc..5463a2b 100644
--- a/src/commands/shell/ctrlg.bash
+++ b/src/commands/shell/ctrlg.bash
@@ -16,6 +16,12 @@ function _ctrlg_tmux_send_all_panes {
         tmux send-keys -t "$pane" "  $1" Enter
       fi
     done
+
+    if [[ $(type -t _ctrlg_get_related_panes) == function ]]; then
+      for pane in $(_ctrlg_get_related_panes); do
+        tmux send-keys -t "$pane" "  $1" Enter
+      done
+    fi
   fi
 }
 
diff --git a/src/commands/shell/ctrlg.fish b/src/commands/shell/ctrlg.fish
index aae7aa3..da3f5e6 100644
--- a/src/commands/shell/ctrlg.fish
+++ b/src/commands/shell/ctrlg.fish
@@ -13,6 +13,11 @@ function _ctrlg_tmux_send_all_panes
                 tmux send-keys -t "$pane" "  $argv" Enter
             end
         end
+        if type _ctrlg_get_related_panes >/dev/null
+            for pane in (_ctrlg_get_related_panes || "")
+                tmux send-keys -t "$pane" "  $argv" Enter
+            end
+        end
     end
 end
 
diff --git a/src/commands/shell/ctrlg.zsh b/src/commands/shell/ctrlg.zsh
index 1bf3552..3171cdd 100644
--- a/src/commands/shell/ctrlg.zsh
+++ b/src/commands/shell/ctrlg.zsh
@@ -15,6 +15,11 @@ function _ctrlg_tmux_send_all_panes() {
         tmux send-keys -t "$pane" "  $1" Enter
       fi
     done
+    if [[ $(type -t _ctrlg_get_related_panes) == function ]]; then
+      for pane in $(_ctrlg_get_related_panes); do
+        tmux send-keys -t "$pane" "  $1" Enter
+      done
+    fi
   fi
 }