diff --git a/README.md b/README.md
index 833b1b4..3b961bb 100644
--- a/README.md
+++ b/README.md
@@ -125,26 +125,28 @@ fi
 ## `~/.config/fish/config.fish`
 
 ```
-if type -q theme.sh
-	if test -e ~/.theme_history
-	theme.sh (theme.sh -l|tail -n1)
-	end
+if status is-interactive
+    if type -q theme.sh
+        if test -e ~/.theme_history
+        theme.sh (theme.sh -l|tail -n1)
+        end
 
-	# Optional
-	# Bind C-o to the last theme.
-	function last_theme
-		theme.sh (theme.sh -l|tail -n2|head -n1)
-	end
+        # Optional
+        # Bind C-o to the last theme.
+        function last_theme
+            theme.sh (theme.sh -l|tail -n2|head -n1)
+        end
 
-	bind \co last_theme
+        bind \co last_theme
 
-	alias th='theme.sh -i'
+        alias th='theme.sh -i'
 
-	# Interactively load a light theme
-	alias thl='theme.sh --light -i'
+        # Interactively load a light theme
+        alias thl='theme.sh --light -i'
 
-	# Interactively load a dark theme
-	alias thd='theme.sh --dark -i'
+        # Interactively load a dark theme
+        alias thd='theme.sh --dark -i'
+    end
 end
 ```