diff --git a/README.md b/README.md
index 299b63f..4447abf 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ git lfs pull
 ### Install rust
 ```
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
-  | sh -s -- -y --default-toolchain "$(cat rust-toolchain)"
+  | sh -s -- -y --default-toolchain nightly
 ```
 
 ### Load cargo environment (or optionally reboot)
@@ -36,6 +36,11 @@ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
 source ~/.cargo/env
 ```
 
+### Ensure rust source is installed for current toolchain
+```
+rustup component add --toolchain "$(cat rust-toolchain)" rust-src
+```
+
 ### Install cargo-xbuild
 ```
 cargo install cargo-xbuild
diff --git a/README.md.in b/README.md.in
index f13f9c7..5beb29a 100644
--- a/README.md.in
+++ b/README.md.in
@@ -28,7 +28,7 @@ git lfs pull
 ### Install rust
 ```
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
-  | sh -s -- -y --default-toolchain "$(cat rust-toolchain)"
+  | sh -s -- -y --default-toolchain nightly
 ```
 
 ### Load cargo environment (or optionally reboot)
@@ -36,6 +36,11 @@ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
 source ~/.cargo/env
 ```
 
+### Ensure rust source is installed for current toolchain
+```
+rustup component add --toolchain "$(cat rust-toolchain)" rust-src
+```
+
 ### Install cargo-xbuild
 ```
 cargo install cargo-xbuild