diff --git a/format.c b/format.c
index 2924c8c0..0aad938f 100644
--- a/format.c
+++ b/format.c
@@ -343,4 +343,10 @@ format_window_pane(struct format_tree *ft, struct window_pane *wp)
 	format_add(ft, "pane_id", "%%%u", wp->id);
 	format_add(ft, "pane_active", "%d", wp == wp->window->active);
 	format_add(ft, "pane_dead", "%d", wp->fd == -1);
+	if (wp->cmd != NULL)
+		format_add(ft, "pane_start_command", "%s", wp->cmd);
+	if (wp->cwd != NULL)
+		format_add(ft, "pane_start_path", "%s", wp->cwd);
+	format_add(ft, "pane_pid", "%ld", (long) wp->pid);
+	format_add(ft, "pane_tty", "%s", wp->tty);
 }
diff --git a/tmux.1 b/tmux.1
index c78ff912..f56cf8d3 100644
--- a/tmux.1
+++ b/tmux.1
@@ -14,7 +14,7 @@
 .\" IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 .\" OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: September 28 2011 $
+.Dd $Mdocdate: October 2 2011 $
 .Dt TMUX 1
 .Os
 .Sh NAME
@@ -2607,7 +2607,11 @@ The following variables are available, where appropriate:
 .It Li "pane_dead" Ta "1 if pane is dead"
 .It Li "pane_height" Ta "Height of pane"
 .It Li "pane_id" Ta "Unique pane id"
+.It Li "pane_pid" Ta "PID of first process in pane"
+.It Li "pane_start_command" Ta "Command pane started with"
+.It Li "pane_start_path" Ta "Path pane started with"
 .It Li "pane_title" Ta "Title of pane"
+.It Li "pane_tty" Ta "Pseudo terminal of pane"
 .It Li "pane_width" Ta "Width of pane"
 .It Li "session_attached" Ta "1 if session attached"
 .It Li "session_created" Ta "Integer time session created"