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Remove contradictory sentence in Environment Vars

The sentence stated that no environment variables are required to use this image. However, the very first variable - POSTGRES_PASSWORD is stated as required. This is a direct contradiction. This change removes that contradiction and clarifies that the password is required.
Aaron 5 years ago
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@@ -47,7 +47,7 @@ There are many ways to extend the `%%REPO%%` image. Without trying to support ev
 
 
 ## Environment Variables
 
 
-The PostgreSQL image uses several environment variables which are easy to miss. While none of the variables are required, they may significantly aid you in using the image.
 
+The PostgreSQL image uses several environment variables which are easy to miss. The only variable required is `POSTGRES_PASSWORD`, the rest are optional.
 
 
 **Warning**: the Docker specific variables will only have an effect if you start the container with a data directory that is empty; any pre-existing database will be left untouched on container startup.