diff --git a/README.md b/README.md
index edfbcd1..c06d5be 100644
--- a/README.md
+++ b/README.md
@@ -4,8 +4,14 @@
 
 
  
-Arbiter PUFs. utilize the intrinsic timing differences of two symmetrically designed paths to a. single bit of the response at the output of the circuit 
 
-Arbiter-based Physically Unclonable Function (PUF) is one kind of the delay-based PUFs that use the time difference of two delay-line signals. 
 
 In cryptography and within embedded security ICs, the PUF is used to create keys that are generated on-demand and instantaneously erased once used. PUF is dependent on random physical factors (unpredictable and uncontrollable) that exist natively and/or are incidentally introduced during a manufacturing process.
+Introduction:Arbiter PUFs. utilize the intrinsic timing differences of two symmetrically designed paths to a. single bit of the response at the output of the circuit 
+
+![image](https://user-images.githubusercontent.com/101010093/208838060-4411eeca-1ad9-4192-83a0-63891747bd52.png)
+fig: Arbiter PUF
+
+working Principle:Arbiter-based Physically Unclonable Function (PUF) is one kind of the delay-based PUFs that use the time difference of two delay-line signals. 
+ ![image](https://user-images.githubusercontent.com/101010093/208838406-ae22c3fe-435d-4a82-bf05-c152d96c4a63.png)
+