diff --git a/README.md b/README.md
index e5a2f35..7c47f43 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,19 @@ Each value of the object is another object with the following possible keys:
 * Generate run arguments from container options.
 * Call `docker run` with arguments.
 
+## How to avoid user prompts
+
+Simply set the following two environment variables:
+* IMAGE - string, the name of the image to build
+* PUSH - int, enter '1' for auto push
+
+You can set these in your Gulp task like so:
+```
+process.env.IMAGE = 'Image name here';
+process.env.PUSH = 1;
+```
+or whereever you set your other environment variables.
+
 ## Dev setup
 
 	npm install