README.md in edge_framework-2.0.0 vs README.md in edge_framework-2.1.0

@@ -171,12 +171,10 @@
 
     <h-tile class="block-7 collapse"> ... </h-tile>
 
 **Convention**:
 
-- Don't name any of your class starting with `block`. It is reserved for tile.
-
 - Don't add your own styling to the tile or ti element.
 
 WORDPRESS
 ====================
 
@@ -395,9 +393,25 @@
     // or
 
     .content {
       @include column($size: 7 / 15, $offset: 3 / 15);
     }
+
+ADAPTIVE GRID
+======================
+
+Normal Grid always expand to 100% at any screen size. This can be a nuisance for complex responsive site because we need to make sure nothing is misaligned on all size.
+
+Adaptive Grid sets a **fixed-width** and shrink to the next width when the screen size reaches the breakpoint.
+
+In setting, change the variable `$adaptive` to true.
+
+You may add more breakpoints in the variable `$adaptive-breakpoint`. You can mix variable and number in the comma-separated list.
+
+Example:
+
+    $adaptive-breakpoint: $medium-screen, 900px, $small-screen, 600px, $mini-screen;
+
 
 TILE - mixin
 ======================
 
     tile()
\ No newline at end of file