diff --git a/Troubleshooting.md b/Troubleshooting.md
index cc5e098..54dda57 100644
--- a/Troubleshooting.md
+++ b/Troubleshooting.md
@@ -36,11 +36,14 @@ If the <kbd>Esc</kbd> key isn't working as expected, add the following in `.tmux
 
 To start `nnn` within tmux use a shell function:
 
-```bash
+```sh
 n ()
 {
-    # use option -a for previews
-    tmux new-session nnn -a $@
+    if [ -n "$TMUX" ]; then
+        nnn -a $@
+    else
+        tmux new-session nnn -a $@
+    fi
 }
 ```