diff --git a/README.md b/README.md
index ceed71c..577430e 100644
--- a/README.md
+++ b/README.md
@@ -13,12 +13,14 @@ Duplicacy supports major cloud storage providers (Amazon S3, Googld Cloud Storag
 * Deletion: every backup can be deleted independently without affecting others
 * Concurrent access: multiple clients can back up to the same storage at the same time
 
-The key idea behind Duplicacy is a concept called **Lock-Free Deduplication**.  There are three elements of lock-free deduplication:
+The key idea behind Duplicacy is a concept called **Lock-Free Deduplication**, which can be summaried as follows:
 
 * Use variable-size chunking algorithm to split files into chunks
 * Store each chunk in the storage using a file name derived from its hash, and rely on the file system API to manage chunks without using a centralized indexing database
 * Apply a *two-step fossil collection* algorithm to remove chunks that become unreferenced after a backup is deleted
 
+The [design document](https://github.com/gilbertchen/duplicacy-beta/blob/master/DESIGN.md) explains lock-free duplication in detail.
+
 ## Getting Started
 
 During beta testing only binaries are available.  Please visit the [releases page](https://github.com/gilbertchen/duplicacy-beta/releases/latest) to download and run the executable for your platform.  Installation is not needed.