diff --git a/libs/libraries.htm b/libs/libraries.htm
index 54b97970d7..8aaef71506 100644
--- a/libs/libraries.htm
+++ b/libs/libraries.htm
@@ -330,6 +330,8 @@ how to download, build, and install the libraries.
tribool - 3-state boolean type library, from Doug Gregor.
tuple - Ease definition of functions returning multiple values, and more,
from Jaakko Järvi.
+ type_erasure -
+ Runtime polymorphism based on concepts, from Steven Watanabe.
type_traits -
Templates for fundamental properties of types, from John
Maddock, Steve Cleary, et al.
@@ -504,6 +506,8 @@ how to download, build, and install the libraries.
from Jaakko Järvi.
variant - Safe, generic, stack-based
discriminated union container, from Eric Friedman and Itay Maman.
+ type_erasure -
+ Runtime polymorphism based on concepts, from Steven Watanabe.