fix: updated docs

docs/helm/helm_install.md

@@ -40,18 +40,19 @@ round-trip to the Tiller server.
 If --verify is set, the chart MUST have a provenance file, and the provenenace
 fall MUST pass all verification steps.
 
-There are four different ways you can express the chart you want to install:
+There are five different ways you can express the chart you want to install:
 
 1. By chart reference: helm install stable/mariadb
 2. By path to a packaged chart: helm install ./nginx-1.2.3.tgz
 3. By path to an unpacked chart directory: helm install ./nginx
 4. By absolute URL: helm install https://example.com/charts/nginx-1.2.3.tgz
+5. By chart reference and repo url: helm install --repo https://example.com/charts nginx
 
 CHART REFERENCES
 
 A chart reference is a convenient way of reference a chart in a chart repository.
 
-When you use a chart reference ('stable/mariadb'), Helm will look in the local
+When you use a chart reference with a repo prefix ('stable/mariadb'), Helm will look in the local
 configuration for a chart repository named 'stable', and will then look for a
 chart in that repository whose name is 'mariadb'. It will install the latest
 version of that chart unless you also supply a version number with the
@@ -108,4 +109,4 @@ helm install [CHART]
 ### SEE ALSO
 * [helm](helm.md)	 - The Helm package manager for Kubernetes.
 
-###### Auto generated by spf13/cobra on 7-Nov-2017
+###### Auto generated by spf13/cobra on 22-Nov-2017