diff --git a/README.md b/README.md
index 70c5473..8145b24 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,16 @@ This example project includes:
 
 
 
+## Install
+
+To install dependencies, run:
+
+```shell
+npm install
+```
+
+
+
 ## Building
 
 To build, run:
diff --git a/contracts/Counter.sol b/contracts/Counter.sol
index d8dcda9..023b4cc 100644
--- a/contracts/Counter.sol
+++ b/contracts/Counter.sol
@@ -8,7 +8,7 @@ contract Counter {
     x++;
   }
 
-  function incBy(uint by) public {
+  function incBy(uint256 by) public {
     require(by > 0, "incBy: increment should be positive");
     x += by;
   }