diff --git a/README.md b/README.md
index 29c8d640..b8aa880b 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,10 @@
 
 **ruma-identifiers** contains types for [Matrix](https://matrix.org/) identifiers for events, rooms, room aliases, and users.
 
+## Minimum Rust version
+
+ruma-identifiers requires Rust 1.34 or later.
+
 ## Documentation
 
 ruma-identifiers has [comprehensive documentation](https://docs.rs/ruma-identifiers) available on docs.rs.