diff --git a/README.md b/README.md
index 5899df0..7b24bc7 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,7 @@ Afterward, the `components` and `target` specified via inputs are installed in a
 | `cache`            | Automatically configure Rust cache (using [`Swatinem/rust-cache`])                     | true          |
 | `cache-workspaces` | Propagates the value to [`Swatinem/rust-cache`]                                        |               |
 | `cache-on-failure` | Propagates the value to [`Swatinem/rust-cache`]                                        | true          |
+| `cache-key`        | Propagates the value to [`Swatinem/rust-cache`] as `key`                               |               |
 | `matcher`          | Enable problem matcher to surface build messages and formatting issues                 | true          |
 | `rustflags`        | Set the value of `RUSTFLAGS` (set to empty string to avoid overwriting existing flags) | "-D warnings" |
 
diff --git a/action.yml b/action.yml
index 8ad465f..d842f6e 100644
--- a/action.yml
+++ b/action.yml
@@ -35,6 +35,9 @@ inputs:
     description: "Also cache on workflow failures"
     default: "true"
     required: false
+  cache-key:
+    description: "An additional cache key that is added alongside the automatic `job`-based cache key and can be used to further differentiate jobs."
+    required: false
   matcher:
     description: "Enable the Rust problem matcher"
     required: false
@@ -185,3 +188,4 @@ runs:
         workspaces: ${{inputs.cache-workspaces}}
         cache-directories: ${{inputs.cache-directories}}
         cache-on-failure: ${{inputs.cache-on-failure}}
+        key: ${{inputs.cache-key}}