Update contributing

[rbdr/map] / README.md

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -65,9 +65,10 @@ you'll get some rendering issues.
 
 ### Groups
 
-You can group nodes together by using `[Group] NodeA NodeB...`. eg.
+You can group nodes together by using `[Group] NodeA, NodeB...`. eg.
 
-- `[Group] Tinker Tailor Soldier`
+- `[Group] Tinker, Tailor, Soldier`
+- `[Group] Two Words, Three Words Here`
 
 ### Notes