diff --git a/guide/english/bootstrap/buttons/index.md b/guide/english/bootstrap/buttons/index.md
index 7b1c68a6dc..703a998ae6 100644
--- a/guide/english/bootstrap/buttons/index.md
+++ b/guide/english/bootstrap/buttons/index.md
@@ -57,6 +57,10 @@ This is a list of the CSS classes that bootstrap provides for buttons.
 
 `<button type="button" class="btn btn-light">Light</button>`
 
+`.btn-dark` Bootstrap's dark button.
+
+`<button type="button" class="btn btn-dark">Dark</button>`
+
 #### Bootstrap Button Sizes:
 This is a list of the CSS classes for different size of the buttons.