diff --git a/source/iostreams.tex b/source/iostreams.tex
index 638dc8bfd8..60efb25673 100644
--- a/source/iostreams.tex
+++ b/source/iostreams.tex
@@ -2316,7 +2316,7 @@
 \begin{itemdescr}
 \pnum
 \returns
-\tcode{rdstate() == 0}
+\tcode{rdstate() == 0}.
 \end{itemdescr}
 
 \indexlibrarymember{eof}{basic_ios}%