diff --git a/modules/tmux/README.md b/modules/tmux/README.md
index 68ba9d0..0e2f652 100644
--- a/modules/tmux/README.md
+++ b/modules/tmux/README.md
@@ -20,12 +20,15 @@ following line to *zpreztorc*:
 
     zstyle ':prezto:module:tmux:auto-start' remote 'yes'
 
-In both cases, it will create a background session named _#Prezto_ and attach
-every new shell to it.
+In both cases, it will create a background session named _prezto_ if the tmux
+server is not started.
 
-To avoid keeping open sessions, this module sets `destroy-unattached off` on
-the background session and `destroy-unattached on` on every other session
-(global setting).
+With `auto-start` enabled, you may want to control how multiple sessions are
+managed. The `destroy-unattached` option of tmux controls if the unattached
+sessions must be kept alive, making sessions available for later use, configured
+in *tmux.conf*:
+
+    set-option -g destroy-unattached [on | off]
 
 Aliases
 -------
@@ -41,7 +44,7 @@ connected** to be displayed, which can be fixed by installing
 [reattach-to-user-namespace][3], available in [Homebrew][4], and adding the
 following to *tmux.conf*:
 
-   set-option -g default-command "reattach-to-user-namespace -l $SHELL -l"
+    set-option -g default-command "reattach-to-user-namespace -l $SHELL -l"
 
 Furthermore, tmux is known to cause **kernel panics** on Mac OS X. A discussion
 about this and Prezto has already been [opened][2].
@@ -54,6 +57,7 @@ Authors
   - [Sorin Ionescu](https://github.com/sorin-ionescu)
   - [Colin Hebert](https://github.com/ColinHebert)
   - [Georges Discry](https://github.com/gdiscry)
+  - [Xavier Cambar](https://github.com/xcambar)
 
 [1]: http://tmux.sourceforge.net
 [2]: https://github.com/sorin-ionescu/prezto/issues/62
diff --git a/modules/tmux/init.zsh b/modules/tmux/init.zsh
index bee24e4..c6c3626 100644
--- a/modules/tmux/init.zsh
+++ b/modules/tmux/init.zsh
@@ -5,6 +5,7 @@
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #   Colin Hebert <hebert.colin@gmail.com>
 #   Georges Discry <georges@discry.be>
+#   Xavier Cambar <xcambar@gmail.com>
 #
 
 # Return if requirements are not found.
@@ -22,25 +23,16 @@ if [[ -z "$TMUX" && -z "$EMACS" && -z "$VIM" ]] && ( \
 ); then
   tmux_session='prezto'
 
-  if ! tmux has-session -t "$tmux_session" 2> /dev/null; then
-    # Ensure that tmux server is started.
-    tmux start-server
-
-    # Disable the destruction of unattached sessions globally.
-    tmux set-option -g destroy-unattached off &> /dev/null
-
-    # Create a new session.
-    tmux new-session -d -s "$tmux_session"
-
-    # Disable the destruction of the new, unattached session.
-    tmux set-option -t "$tmux_session" destroy-unattached off &> /dev/null
-
-    # Enable the destruction of unattached sessions globally to prevent
-    # an abundance of open, detached sessions.
-    tmux set-option -g destroy-unattached on &> /dev/null
+  # Create a first 'prezto' session if tmux is starting.
+  if ! tmux has-session 2> /dev/null; then
+    tmux \
+      start-server \; \
+      new-session -d -s "$tmux_session" \; \
+      set-option -t "$tmux_session" destroy-unattached off &> /dev/null
   fi
 
-  exec tmux new-session -t "$tmux_session"
+  # Attach to the 'prezto' session or to the last session used.
+  exec tmux attach-session
 fi
 
 #
diff --git a/runcoms/zpreztorc b/runcoms/zpreztorc
index 80f2a05..a54fdb0 100644
--- a/runcoms/zpreztorc
+++ b/runcoms/zpreztorc
@@ -152,4 +152,3 @@ zstyle ':prezto:module:prompt' theme 'sorin'
 
 # Auto start a session when Zsh is launched in a SSH connection.
 # zstyle ':prezto:module:tmux:auto-start' remote 'yes'
-