diff --git a/pep-0498.txt b/pep-0498.txt
index d64a3afe1..0a446aa55 100644
--- a/pep-0498.txt
+++ b/pep-0498.txt
@@ -187,8 +187,10 @@ Once tokenized, f-strings are parsed in to literal strings and
 expressions.  Expressions appear within curly braces ``'{'`` and
 ``'}'``.  While scanning the string for expressions, any doubled
 braces ``'{{'`` or ``'}}'`` inside literal portions of an f-string are
-replaced by the corresponding single brace.  Doubled opening braces do
-not signify the start of an expression.
+replaced by the corresponding single brace.  Doubled literal opening
+braces do not signify the start of an expression.  A single closing
+curly brace ``'}'`` in the literal portion of a string is an error:
+literal closing curly braces must be doubled ``'}}'``.
 
 The parts of the f-string outside of braces are literal
 strings.  These literal portions are then decoded.  For non-raw