diff --git a/README.md b/README.md
index 335ed08..5de02f0 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 For a steady stream of TILs from a variety of rocketeers, checkout
 [til.hashrocket.com](https://til.hashrocket.com/).
 
-_856 TILs and counting..._
+_857 TILs and counting..._
 
 ---
 
@@ -722,6 +722,7 @@ _856 TILs and counting..._
 
 - [Adjusting Window Pane Size](tmux/adjusting-window-pane-size.md)
 - [Break Current Pane Out To Separate Window](tmux/break-current-pane-out-to-separate-window.md)
+- [Change Base Directory Of Existing Session](tmux/change-base-directory-of-existing-session.md)
 - [Create A Named tmux Session](tmux/create-a-named-tmux-session.md)
 - [Create A New Session In A New Server](tmux/create-a-new-session-in-a-new-server.md)
 - [Cycle Through Layouts](tmux/cycle-through-layouts.md)
diff --git a/tmux/change-base-directory-of-existing-session.md b/tmux/change-base-directory-of-existing-session.md
new file mode 100644
index 0000000..cdaf084
--- /dev/null
+++ b/tmux/change-base-directory-of-existing-session.md
@@ -0,0 +1,17 @@
+# Change Base Directory Of Existing Session
+
+Each tmux session has a base directory. This is determined when you first
+create the session. When you open a new window or pane, this will be used as
+the base directory of your new shell session.
+
+You can change the base directory of an existing tmux session.
+
+First, detach from the session: `<prefix>d`
+
+Then, re-attach using the `-c` flag:
+
+```bash
+$ tmux attach -t your-session-name -c /new/base/dir
+```
+
+[source](https://stackoverflow.com/a/36435535/535590)