Update README.md

README.md

@@ -2,19 +2,23 @@ docker-thanos
 ===
 
 A Docker image to run Thanos. All Thanos components are run by default on
-container startup, individual components can be disabled via the environment.
+container startup.
+
+Individual components can be disabled by setting `<COMPONENT>_OFF` environment variables.
 
 Component ports are configured as described here:
 https://thanos.io/getting-started.md/#testing-thanos-on-single-host
 
 The following environment variables are understood:
 
-QUERY_OFF
+```
+QUERY_OFF # true/yes
 QUERY_HTTP_ADDRESS
 QUERY_GRPC_ADDRESS
 QUERY_FLAGS
 
-SIDECAR_OFF
+SIDECAR_OFF # true/yes
 SIDECAR_HTTP_ADDRESS
 SIDECAR_GRPC_ADDRESS
 SIDECAR_FLAGS
+```
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