diff --git a/static/tutorial/create-image.html b/static/tutorial/create-image.html
index b6316e82c..2b2957102 100644
--- a/static/tutorial/create-image.html
+++ b/static/tutorial/create-image.html
@@ -2,8 +2,14 @@
    <div class="control-group">
     <label class="control-label" for="containerId">Enter a repo name:</label>
     <div class="form-inline">
-      <input type="text" id="containerId" class="form-control" ng-model="tour.tourScope.repoName">
+      <form name="repoNameForm">
+        <input type="text" id="repoName" name="repoName" class="form-control"
+               ng-model="tour.tourScope.repoName" ng-pattern="/^[a-z0-9_-]+$/">
+      </form>
     </div>
+    <span ng-show="!repoNameForm.repoName.$valid" style="margin-left: 10px; margin-top: 7px;">
+      Repository names must match [a-z0-9_-]+
+    </span>
   </div>
 </div>