diff --git a/action.yml b/action.yml
index fa6bd89..8ad465f 100644
--- a/action.yml
+++ b/action.yml
@@ -28,6 +28,9 @@ inputs:
   cache-workspaces:
     description: "Paths to multiple Cargo workspaces and their target directories, separated by newlines."
     required: false
+  cache-directories:
+    description: "Additional non workspace directories to be cached, separated by newlines."
+    required: false
   cache-on-failure:
     description: "Also cache on workflow failures"
     default: "true"
@@ -180,4 +183,5 @@ runs:
       uses: Swatinem/rust-cache@v2
       with:
         workspaces: ${{inputs.cache-workspaces}}
+        cache-directories: ${{inputs.cache-directories}}
         cache-on-failure: ${{inputs.cache-on-failure}}