diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 148cf9391bf..1969d508061 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -43,6 +43,8 @@ jobs:
     steps:
     # actions/checkout@v2
     - uses: actions/checkout@28c7f3d2b5162b5ddd3dfd9a45aa55eaf396478b
+    - uses: Swatinem/rust-cache@v1
+      if: ${{ github.ref != 'refs/heads/main' }}
     - name: Report cargo version
       run: cargo --version
     - name: Check build of deployed Omicron packages
@@ -55,6 +57,8 @@ jobs:
     steps:
     # actions/checkout@v2
     - uses: actions/checkout@28c7f3d2b5162b5ddd3dfd9a45aa55eaf396478b
+    - uses: Swatinem/rust-cache@v1
+      if: ${{ github.ref != 'refs/heads/main' }}
     - name: Report cargo version
       run: cargo --version
     - name: Report Clippy version
@@ -76,6 +80,8 @@ jobs:
     steps:
     # actions/checkout@v2
     - uses: actions/checkout@28c7f3d2b5162b5ddd3dfd9a45aa55eaf396478b
+    - uses: Swatinem/rust-cache@v1
+      if: ${{ github.ref != 'refs/heads/main' }}
     - name: Report cargo version
       run: cargo --version
     - name: Test build documentation
@@ -92,6 +98,8 @@ jobs:
     steps:
     # actions/checkout@v2
     - uses: actions/checkout@28c7f3d2b5162b5ddd3dfd9a45aa55eaf396478b
+    - uses: Swatinem/rust-cache@v1
+      if: ${{ github.ref != 'refs/heads/main' }}
     - name: Report cargo version
       run: cargo --version
     - name: Configure GitHub cache for CockroachDB binaries
diff --git a/README.adoc b/README.adoc
index 85bbb73caa6..47ee24a6f10 100644
--- a/README.adoc
+++ b/README.adoc
@@ -34,7 +34,7 @@ The code here is still rough, but the following are implemented:
 
 * actual API:
 ** projects: CRUD
-** instances: CRUD + boot/halt/reboot (simulated)
+** instances: CRUD + boot/halt/reboot.
 ** disks: CRD + attach/detach (simulated)
 ** racks: list + get
 ** sleds: list + get