diff --git a/source/containers.tex b/source/containers.tex
index 9bdd663d32..d7eda39fc8 100644
--- a/source/containers.tex
+++ b/source/containers.tex
@@ -2738,7 +2738,7 @@
 when \tcode{X} supports unique keys,
 \item
 \tcode{a_eq} denotes a value of type \tcode{X}
-when \tcode{X} supports multiple keys,
+when \tcode{X} supports equivalent keys,
 \item
 \tcode{a_tran} denotes a value of type \tcode{X} or \tcode{const X}
 when the \grammarterm{qualified-id}