diff --git a/src/index.html b/src/index.html
index beda577..fcc29d4 100644
--- a/src/index.html
+++ b/src/index.html
@@ -98,7 +98,7 @@
                             <div class="form-group">
                                 <label for="entropy" class="col-sm-2 control-label">Entropy</label>
                                 <div class="col-sm-10">
-                                    <input id="entropy" class="entropy form-control" placeholder="Accepts binary, base 6, 6-sided dice, base 10, hexadecimal">
+                                    <input id="entropy" class="entropy form-control" placeholder="Accepts binary, base 6, 6-sided dice, base 10, hexadecimal, cards">
                                     <span class="help-block">
                                         <div class="text-danger">
                                         This is an advanced feature.