diff --git a/source/ranges.tex b/source/ranges.tex
index 49d03483b4..0e9956570d 100644
--- a/source/ranges.tex
+++ b/source/ranges.tex
@@ -5866,7 +5866,9 @@
 \end{codeblock}
 
 \pnum
-The \grammarterm{typedef-name} \tcode{iterator_category} denotes:
+If \exposid{Base} does not model \libconcept{forward_range}
+there is no member \tcode{iterator_category}.
+Otherwise, the \grammarterm{typedef-name} \tcode{iterator_category} denotes:
 \begin{itemize}
 \item
 \tcode{forward_iterator_tag} if