Add note about the tool not working the first week

index.html

@@ -17,9 +17,13 @@
     This tool is in early development - it will work best if you have all of the days data, morning and night.
     Without that it will not work hugely well.
     At a minimum this needs the buy price!
-
+  </p>
+  <p>
     I couldn't have done this without <a href="https://twitter.com/_Ninji/status/1244818665851289602?s=20">Ninji's work extracting the code</a>
   </p>
+  <p>
+    The first week in which you buy turnips from Daisy is treated specially - this tool doesn't handle that. It will only work if this is the second week onwards
+  </p>
   <form>
     <p>
       <label>Daisy Mae</label><br>
@@ -102,7 +106,7 @@
 
   <p>
     <table>
-      <caption>Your turnip prices will be one of the following patterns. Each cell contains the minimum..maximum price for that half-day.</caption>
+      <caption>Your turnip prices will be one of the following patterns. Each cell contains the minimum..maximum price for that half-day. If you don't have a pattern, this likely means that this is the first week that you bought turnips from Daisy in your farm - and this tool won't work for you. Check back next week!</caption>
       <thead>
         <tr>
           <th>Pattern</th>