Update docs, regarding java version

docs/install.md

@@ -2,12 +2,16 @@ This document will outline how to install Manzan on to IBM i. Manzan is install
 
 Building Manzan is easy for IBM i and we provide makefiles to simplify the entire process.
 
+## Which Java to use
+Use a Java version provided by IBM, which is at least version 8. When running the `java -version` command, the output 
+should contain the string `IBM Semeru Runtime Certified Edition`. Otherwise, Manzan may not function properly.
+
 ## Install from GitHub release 
 
 To install from a github release, simply perform the following steps:
 1. Download the latest binary release from [the releases page](https://github.com/ThePrez/Manzan/releases)
-1. If you didn't download to IBM i directly, transfer the `.jar` file to IBM i using technique of your choice
-1. Run `java -jar <name of jar file>`
+2. If you didn't download to IBM i directly, transfer the `.jar` file to IBM i using technique of your choice
+3. Run `java -jar <name of jar file>`
 
 For instance, to install version `0.0.6`, the steps from an IBM i (using open source `wget`) would look like:
 ```bash