diff --git a/templates/walletform.html b/templates/walletform.html
index 4f88f2208..84d47b2ad 100644
--- a/templates/walletform.html
+++ b/templates/walletform.html
@@ -58,6 +58,10 @@
                    </button>
                 {% endif %}
     </form>
+    <details><summary>Do NOT invent your own filenaming scheme. <br />Click for more details.</summary>
+<div align="left">We have a 20-year old scheme for naming scanned files, <br><br>
+Name the scanned pages <em>"notes-cavepassagename.jpg"</em> etc., (or <em>notes-1.jpg</em> if you must, but self-describing filenames are much better). This is important as a script detects whether these files exist (with names beginning <em>"notes..", "plan.." and "elev.."</em>) and if you name them something else it will hassle you unnecessarily. (Or you can use this format <em>cavepassagename5-notes.jpg</em> if you like.)
+Handbook: <a href="/handbook/survey/newwallet.html">Creating a Wallet</a>   </div></details> 
 </div>
 <div style = "max-width:29%; margin-left:20%; text-align: left" >
     {% if filesaved %}