diff --git a/Cargo.toml b/Cargo.toml
index e9f3459..b7f6058 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,3 +9,4 @@ keywords = ["memory", "slice", "array"]
 categories = ["data-structures"]
 repository = "https://git.nora.codes/nora/nslice"
 readme = "README.md"
+rust-version = "1.56.1"
diff --git a/README.md b/README.md
index 7f873a7..9a2d500 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ either exactly or at least some compile-time-known number of values.
 This is useful when dealing with a slice whose length you expect to be exactly
 or at least some particular length;
 rather than making runtime checks on each access,
-you can check the length once and access values freely with no copying. 
+you can check the length once and access values freely with no copying.
 
 ```rust
 # use nslice::MinSlice;
@@ -18,8 +18,13 @@ let minslice: &MinSlice<_, 3> = MinSlice::from_slice(slice).unwrap();
 assert_eq!(minslice.tail.len(), 3);
 assert_eq!(minslice.head[0], 1);
 assert_eq!(minslice.tail[2], 6);
-``` 
+```
+
+## MSRV
+
+This project supports Rust 1.56.1 and onward.
 
 ## License
 
 This project is licensed MIT.
+
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..071aaaa
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.56.1"