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diff --git a/README b/README
index b2c936b..5e4c0b6 100644
--- a/README
+++ b/README
@@ -60,6 +60,22 @@ Text content
 </div>
 ```
 
+### `highlight-left` / `highlight-right` - Column Emphasis
+```markdown
+---
+<!-- _class: layout-2col-center highlight-left -->
+
+<div class="left-column">
+Normal opacity
+</div>
+
+<div class="right-column">
+Faded out
+</div>
+```
+
+Dims the other column of `layout-2col` / `layout-2col-center`. Use across slides to build up a comparison.
+
 ### `cite` - Citation/Attribution
 ```markdown
 ---