diff --git a/README.md b/README.md
index 2360e3f..4958af9 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
 ## About
-This repositories if for foundry study (Thanks Patrick Collins the youtuber who provide the course a lot!)
+This repositories is for foundry study (Thanks Patrick Collins the youtuber who provide the course a lot!)
 
 course source: https://github.com/Cyfrin/foundry-full-course-cu
diff --git a/test/unit/RaffleTest.t.sol b/test/unit/RaffleTest.t.sol
index 1b1f82a..a16aab4 100644
--- a/test/unit/RaffleTest.t.sol
+++ b/test/unit/RaffleTest.t.sol
@@ -335,11 +335,12 @@ contract ToolTest is Test {
 
 
     //3way to get a function's selector (case1's 'this' can be replace to a instance of a contract);
-    function testEncoderWithSelector() public pure {
+    function testEncoderWithSelector() public view {
         bytes4 output1 = this.testCastMultiFlag.selector;
         bytes4 output2 = bytes4(keccak256("testCastMultiFlag()"));
         bytes4 output3 = bytes4(abi.encodeWithSignature("testCastMultiFlag()"));
 
+        console.log(address(this));
         assertEq(output1, output2);
         assertEq(output3, output2);
     }