diff --git a/README.md b/README.md
index 093e12d..1518e1a 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,9 @@
 
 A search tool for free software replacements. 
 
-# How to add new software:
+# CONTRIBUTE!
+
+## How to add new software:
 
 In the [apps](apps) folder there are a bunch of json files for software. Here is an example:
 
@@ -37,6 +39,15 @@ In the [apps](apps) folder there are a bunch of json files for software. Here is
  "issues":["Surveillance", "Non-Free Software", "Non-Free JavaScript", "DRM"]}
 ```
 
+## Create a `port.json`
+When modifying the code, in order to test changes you need to rerun and put in the port number over and over. To solve this you can create a file called `port.json`:
+```json
+{
+	"port": "8080"
+}
+```
+Now it will stop asking for port numbers and use the port you put in the json file.
+
 # TO DO
 - [x] Add interfaces and language parameters in json
 - [x] Documentation parameter in json