diff --git a/source/intro.tex b/source/intro.tex
index bf976a7246..2058956582 100644
--- a/source/intro.tex
+++ b/source/intro.tex
@@ -321,7 +321,7 @@
 \impldef{strict total order over pointer values}
 strict total ordering over all pointer values
 such that the ordering is consistent with the partial order
-imposed by the builtin operators
+imposed by the built-in operators
 \tcode{<}, \tcode{>}, \tcode{<=}, \tcode{>=}, and \tcode{<=>}
 
 \indexdefn{limits!implementation}%