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diff --git a/README.md b/README.md
index 135052e..aa2d0bd 100644
--- a/README.md
+++ b/README.md
@@ -108,6 +108,8 @@ To check in on the status of recent editgroups, or to "submit" them for review:
 You need a Rust toolchain installed, and the `libsodium-dev` system package.
 There are Makefile helpers, run `make help` to print a list of commands.
 
+The Minimum Supported Rust Version (MSRV) is 1.49 (released in late 2020).
+
 
 ## Thanks!