diff --git a/spec.md b/spec.md
index 66dbad4..ea85fbe 100644
--- a/spec.md
+++ b/spec.md
@@ -220,7 +220,7 @@ For example:
 </html>
 ```
 
-Declare statements MUST contain no spaces and MUST be exactly `declare(strict_types=1)`
+Declare statements MUST NOT contain any spaces and MUST be exactly `declare(strict_types=1)`
 (with an optional semicolon terminator).
 
 Block declare statements are allowed and MUST be formatted as below. Note position of