Add nightly hint to xtask toolchain parameter

README.md

@@ -14,7 +14,7 @@ cargo xtask build-ebpf
 
 To perform a release build you can use the `--release` flag.
 You may also change the target architecture with the `--target` flag.
-If you require a specific (nightly) version of the toolchain, you can use the `--toolchain` flag.
+If you require a specific version of the toolchain, you can use the `--toolchain` flag (only nightly toolchains are supported).
 
 ## Build Userspace
 

xtask/src/build_ebpf.rs

@@ -34,7 +34,7 @@ pub struct Options {
     /// Set the endianness of the BPF target
     #[clap(default_value = "bpfel-unknown-none", long)]
     pub target: Architecture,
-    /// Set the rust toolchain
+    /// Set the rust toolchain (only nightly toolchains are supported)
     #[clap(default_value = "+nightly", long)]
     pub toolchain: String,
     /// Build the release target

xtask/src/run.rs

@@ -19,7 +19,7 @@ pub struct Options {
     /// Arguments to pass to your application
     #[clap(name = "args", last = true)]
     pub run_args: Vec<String>,
-    /// Set the rust toolchain
+    /// Set the rust toolchain (only nightly toolchains are supported)
     #[clap(default_value = "+nightly", long)]
     pub toolchain: String,
 }