diff --git a/README.md b/README.md
index 67ed56b..e86b5b1 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,7 @@ This file contains a number of front-end interview questions that can be used wh
 * What's the difference between "resetting" and "normalizing" CSS? Which would you choose, and why?
 * Describe Floats and how they work.
 * Describe z-index and how stacking context is formed.
+* Describe BFC(Block Formatting Context) and how it works.
 * What are the various clearing techniques and which is appropriate for what context?
 * Explain CSS sprites, and how you would implement them on a page or site.
 * What are your favourite image replacement techniques and which do you use when?
@@ -148,7 +149,7 @@ duplicate([1,2,3,4,5]); // [1,2,3,4,5,1,2,3,4,5]
   * Transfer-Encoding
   * ETag
   * X-Frame-Options
-* What are HTTP actions? List all HTTP actions that you know, and explain them. 
+* What are HTTP actions? List all HTTP actions that you know, and explain them.
 
 #### Coding Questions: