diff --git a/SPEC.md b/SPEC.md
index fcd82f8..a02f31d 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -873,7 +873,7 @@ ws-escape := '\' (unicode-space | newline)+
 hex-digit := [0-9a-fA-F]
 
 raw-string := '#' raw-string-quotes '#' | '#' raw-string '#'
-raw-string-quotes := '"' single-line-raw-string-body '"' | '"""' newline multi-line-raw-string-body newline '"""'
+raw-string-quotes := '"' single-line-raw-string-body '"' | '"""' newline multi-line-raw-string-body newline unicode-space* '"""'
 single-line-raw-string-body := '' | (single-line-raw-string-char - '"') single-line-raw-string-char*? | '"' (single-line-raw-string-char - '"') single-line-raw-string-char*?
 single-line-raw-string-char := unicode - newline - disallowed-literal-code-points
 multi-line-raw-string-body := (unicode - disallowed-literal-code-points)*?