diff --git a/text/0003-blockspace-regions.md b/text/0003-blockspace-regions.md
index 35457f2..6313847 100644
--- a/text/0003-blockspace-regions.md
+++ b/text/0003-blockspace-regions.md
@@ -90,7 +90,7 @@ struct RegionSchema {
     // consumed with infrequent large state transitions or frequent small state
     // transitions.
     //
-    // This value may not be greater than `RATE_DENOMINATOR`.
+    // This value must not be greater than `RATE_DENOMINATOR`.
     rate: PartsOf57600,
 }