diff --git a/rules.gmi b/rules.gmi
index 08be024..8c4e583 100644
--- a/rules.gmi
+++ b/rules.gmi
@@ -31,3 +31,6 @@ A Person, having submitted a proposal that has been adopted, is entitled to a nu
 
 ## Rule 8 (immutable)
 A Person, having achieved 100 points, has won Cosmonomic.
+
+## Rule 9 (mutable)
+A Person having submitted a proposal which within its 14 day period of consideration may not submit any other proposals. When the initial proposal has been considered and adopted or rejected the person who submitted that proposal is once again eligible to submit additional proposals. Any proposal submitted contrary to this rule will be automatically defeated and shall not take effect.