diff --git a/source/lex.tex b/source/lex.tex
index 8005b33374..f9ce56b5dc 100644
--- a/source/lex.tex
+++ b/source/lex.tex
@@ -1501,7 +1501,7 @@
 
 \begin{bnf}
 \nontermdef{conditional-escape-sequence-char}\br
-    \textnormal{any member of the basic character set that is not an} octal-digit\textnormal{, a} simple-escape-sequence-char\textnormal{, or the characters \terminal{N}, \terminal{o}, \terminal{u}, \terminal{U}, or \terminal{x}}
+    \textnormal{any member of the basic character set that is not an} octal-digit\textnormal{, a} simple-escape-sequence-char\textnormal{, nor one of the characters \terminal{N}, \terminal{o}, \terminal{u}, \terminal{U}, or \terminal{x}}
 \end{bnf}
 
 \pnum