diff --git a/index.html b/index.html
index 534884d..2ece423 100644
--- a/index.html
+++ b/index.html
@@ -19,7 +19,7 @@ <h1 class="text-center mb-4">Expense Tracker</h1>
                     </div>
                     <div class="form-group">
                         <label for="item-cost">Item cost (£):</label>
-                        <input type="number" class="form-control" id="item-cost" step="0.01" required>
+                        <input type="number" class="form-control" id="item-cost" pattern="[0-9]*" step="0.01" required>
                     </div>
                     <div class="form-group">
                         <label for="item-description">Item description:</label>