diff --git a/app/index.html b/app/index.html
index 2661e09..8dc239e 100644
--- a/app/index.html
+++ b/app/index.html
@@ -45,7 +45,7 @@ <h2 class="text-semi-muted">threebody</h2>
 
         <div class="col-sm-6">
           <select class="form-control ic-selector" id="preset-ic-selector">
-            <optgroup label="stable">
+            <optgroup label="bounded">
               <option>figure 8</option>
               <option>Brouke-H&eacute;non</option>
               <option>Chen retrograde orbit</option>
@@ -54,7 +54,7 @@ <h2 class="text-semi-muted">threebody</h2>
               <option>Sun, Jupiter, Earth</option>
               <option>Binary star, transferring planet</option>
             </optgroup>
-            <optgroup label="unstable">
+            <optgroup label="unbounded">
               <option>equilateral, equal masses</option>
               <option>Pythagorean</option>
               <option>Binary star, escaping planet</option>