diff --git a/README.md b/README.md
index 9688bfc..8997277 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,7 @@ Add the following steps to your GitHub workflow, replacing the input values:
       ]
     # Parent directory to use for generated API docs HTML
     api-docs-dir: 'YOUR_API_DOCS_FILEPATH'
+    workspace-dir: 'OPTIONAL_RELATIVE_PATH_TO_THE_OPENAPI_SCHEMA'
 ```
 
 ## Scenarios
diff --git a/action.yml b/action.yml
index bcb6c7a..2c4560b 100644
--- a/action.yml
+++ b/action.yml
@@ -12,6 +12,9 @@ inputs:
   api-docs-dir:
     description: Parent directory to use for API docs
     required: true
+  src-dir:
+    description: Optional directory to run the generation script from
+    required: false
 
 # Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
 # However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
@@ -57,6 +60,8 @@ runs:
         GH_TOKEN: ${{ github.token }}
         # Used to return to caller's repository directory
         WORKSPACE_DIR: ${{ github.workspace }}
+        # Used for multi-file API specs, run the script from this directory to correctly resolve relative paths in references
+        SRC_DIR: ${{ inputs.src-dir }}
     - name: Set up GitHub Pages
       uses: actions/configure-pages@v5
     - name: Upload API docs to GitHub Pages
diff --git a/scripts/generate-single-spec-doc.sh b/scripts/generate-single-spec-doc.sh
index fbc51db..b2e31d8 100644
--- a/scripts/generate-single-spec-doc.sh
+++ b/scripts/generate-single-spec-doc.sh
@@ -56,6 +56,12 @@ else
         $apiSpecFetchUri > $openApiJsonFilepath
 fi
 
+# Go to the source directory if provided
+if [ -n "$SRC_DIR" ]; then
+    echo "Changing directory to SRC_DIR: $SRC_DIR"
+    cd "${SRC_DIR}"
+fi
+
 # Validate OpenAPI JSON spec exists
 if [ ! -f "$openApiJsonFilepath" ]; then
     echo "Failed to generate API documentation since API spec was not found at $openApiJsonFilepath"