diff --git a/ipynbsrv/web/templates/web/container_snapshots/modal_create.html b/ipynbsrv/web/templates/web/container_snapshots/modal_create.html
index b87aa5e..8a0b991 100644
--- a/ipynbsrv/web/templates/web/container_snapshots/modal_create.html
+++ b/ipynbsrv/web/templates/web/container_snapshots/modal_create.html
@@ -14,7 +14,7 @@ <h4 class="modal-title">New Container Snapshot</h4>
                     <div class="form-group">
                         <label for="name">Name</label>
                         <input name="name" type="text" pattern="[A-Za-z1-9_-]+" class="form-control" required>
-                        <p class="help-text">Allowed pattern: ^[A-z]\w*$</p>
+                        <p class="help-block">Allowed pattern: ^[A-z]\w*$</p>
                     </div>
                     <div class="form-group">
                         <label for="description">Description</label>
diff --git a/ipynbsrv/web/templates/web/containers/modal_create.html b/ipynbsrv/web/templates/web/containers/modal_create.html
index 32c2f7c..f006c04 100644
--- a/ipynbsrv/web/templates/web/containers/modal_create.html
+++ b/ipynbsrv/web/templates/web/containers/modal_create.html
@@ -13,6 +13,7 @@ <h4 class="modal-title">New container</h4>
                     <div class="form-group">
                         <label for="name">Name</label>
                         <input name="name" type="text" pattern="[A-Za-z1-9_-]+" class="form-control" placeholder="e.g IPython Notebook" required>
+                        <p class="help-block">Allowed pattern: ^[A-z]\w*$</p>
                     </div>
                     <div class="form-group">
                         <label for="description">Description</label>
diff --git a/ipynbsrv/web/templates/web/images/modal_create.html b/ipynbsrv/web/templates/web/images/modal_create.html
index 865e5d3..bf3fd51 100644
--- a/ipynbsrv/web/templates/web/images/modal_create.html
+++ b/ipynbsrv/web/templates/web/images/modal_create.html
@@ -22,7 +22,7 @@ <h4 class="modal-title">New image</h4>
                     <div class="form-group">
                         <label for="img_name">Name</label>
                         <input name="img_name" type="text" pattern="[A-Za-z1-9_-]+" class="form-control" placeholder="e.g fhnw-maths " required>
-                        <p class="help-text">Allowed pattern: ^[A-z][\w\/]*$</p>
+                        <p class="help-block">Allowed pattern: ^[A-z][\w\/]*$</p>
                     </div>
                     <div class="form-group">
                         <label for="description">Description</label>