diff --git a/source/lib-intro.tex b/source/lib-intro.tex
index 7a819dcd28..c4a646a830 100644
--- a/source/lib-intro.tex
+++ b/source/lib-intro.tex
@@ -54,7 +54,7 @@
 storage management~(\ref{basic.stc.dynamic}), and components used
 as infrastructure
 in \Cpp programs,
-such as a tuples, function wrappers, and time facilities.
+such as tuples, function wrappers, and time facilities.
 
 \pnum
 The strings library (Clause~\ref{strings}) provides support for manipulating text represented