1 files changed, 2 insertions, 0 deletions
diff --git a/RULES b/RULES
index b042e22..85ce751 100644
--- a/RULES
+++ b/RULES
@@ -28,6 +28,8 @@
 1-8. In order to implement "radio-button" UI (choose only one), the block name starts with "chooseonlyone_"
 	E.g., "building-blocks-root-chooseonlyone_Kernel"
 
+1-9. [NAME] = [a-zA-Z0-9_]+
+
 
 
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