how-to-sync-repos.md

@@ -15,6 +15,10 @@ $ git fetch upstream
 > Unpacking objects: 100% (62/62), done.    
 > From https://github.com/RocketChat/Rocket.Chat.ReactNative/>  * [new branch]      master     -> upstream/master    
 
+If upstream is not available yet, add it: 
+
+>  git remote add upstream https://github.com/RocketChat/Rocket.Chat.ReactNative
+
 Check out your fork's local master branch.
 
 $ git checkout master   
@@ -48,9 +52,8 @@ Instead of merging, we may want to rebase so that we have a new master with all
 > git checkout master
 > git rebase upstream/master
 
-If everything was fine, then you might push it. Only do so, when nobody else has been working on the fairchatRN, as master is shifted!
+If everything was fine, then you might push it. Only do so, when nobody else has been working on the fairchatRN, as master is shifted! Be very careful with this command!
 
-> # Be very careful with this command!
 > git push --force
 
 Source: https://www.atlassian.com/de/git/tutorials/merging-vs-rebasing
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