diff --git a/source/lex.tex b/source/lex.tex
index 80f2e8c1e6..e88e50a0d6 100644
--- a/source/lex.tex
+++ b/source/lex.tex
@@ -1021,7 +1021,7 @@
 \indextext{keyword|(}%
 The identifiers shown in \tref{lex.key} are reserved for use
 as keywords (that is, they are unconditionally treated as keywords in
-phase 7) except in an \grammarterm{attribute-token}\iref{dcl.attr.grammar}.
+phases 6 and 7) except in an \grammarterm{attribute-token}\iref{dcl.attr.grammar}.
 \begin{note}
 The \keyword{register} keyword is unused but
 is reserved for future use.