diff --git a/README.MD b/README.MD
index e61a93c..f4ce33b 100644
--- a/README.MD
+++ b/README.MD
@@ -138,6 +138,9 @@ These parameters are only used when `run-tests-and-coverage` is enabled and are
 | `additional-tarpaulin-args`  | No       | `''`                 | Additional arguments passed directly to the cargo tarpaulin command.                                  |
 | `codecov-flags`              | No       | `'unittests'`        | Flags to pass to Codecov for organizing coverage reports.                                             |
 | `codecov-name`               | No       | `'codecov-umbrella'` | Custom defined name for the coverage upload.                                                          |
+| `packages`                   | No       | `''`                 | Multi-line list of package names to test (one per line). If empty, tests all packages in workspace.   |
+
+**Note:** The `packages` parameter is passed through to the test action and does not affect which binary is built.
 
 **Note:** The following parameters are used by both this action AND passed through to the test action: `target`, `features`, `no-default-features`, `use-cross`.
 
diff --git a/action.yml b/action.yml
index 4d74df8..0a13b05 100644
--- a/action.yml
+++ b/action.yml
@@ -165,6 +165,10 @@ inputs:
     description: "Additional arguments to pass to the cargo tarpaulin command"
     required: false
     default: ""
+  packages:
+    description: "Packages to test (multi-line list). Passed through to devops-rust-test-and-coverage. Selects packages for testing; does not influence the build."
+    required: false
+    default: ""
   codecov-flags:
     description: "Flags to pass to Codecov for organizing coverage reports"
     required: false
@@ -555,3 +559,4 @@ runs:
         codecov-flags: ${{ inputs.codecov-flags }}
         codecov-name: ${{ inputs.codecov-name }}
         additional-tarpaulin-args: ${{ inputs.additional-tarpaulin-args }}
+        packages: ${{ inputs.packages }}