diff --git a/reference/src/introduction.md b/reference/src/introduction.md
index 658d91f3..461e8458 100644
--- a/reference/src/introduction.md
+++ b/reference/src/introduction.md
@@ -8,5 +8,7 @@
 * *niche*
 * *layout*
 * *tag*
+* *rvalue*
+* *lvalue*
 
 ## Unsafe abstraction