diff --git a/README.md b/README.md
index 8c042a7..df8e516 100644
--- a/README.md
+++ b/README.md
@@ -4,12 +4,19 @@
 
 Push docker image to remote dokku server then deploy it
 
+
+## Prerequisites
+
+Make sure you have crystal (>= 0.31) installed on your system.
+
+
 ## Installation
 
-Run the following comand
+Run the following command:
 
     make build
 
+
 ## Usage
 
 Show help