Note that 9999.99.0.0 will not allow user to go back to OI-provided packages

Author: pyhalov

docs/developers/build.md

@@ -191,6 +191,9 @@ can find out the current branch version with `pkg info`:
 $ pkg info osnet-incorporation | grep Branch:
         Branch: 2018.0.0.18230
 ```
+If you want to be able to update your system to illumos-gate packages, provided
+by OpenIndiana, it's adviced to increment only last number of the branch
+version.
 
 ### OmniOS