diff --git a/action.yml b/action.yml
new file mode 100644
index 0000000..6fe43de
--- /dev/null
+++ b/action.yml
@@ -0,0 +1,30 @@
+name: 'Generate shapes from OSM data'
+description: 'Use pfaedle to generate shapes from OSM data for a GTFS feed.'
+
+inputs:
+  gtfs_file:
+    description: 'Path to GTFS .zip file.'
+    required: true
+  osm_file:
+    description: 'Path to OSM .pbf file.'
+    required: true
+  mot:
+    description: 'Mode of transport to generate shapes for.'
+    required: false
+    default: 'all'
+  output_file:
+    description: 'Path to output GTFS .zip file.'
+    required: true
+
+runs:
+    using: 'docker'
+    image: 'Dockerfile'
+    args:
+      - '-i'
+      - ${{ inputs.gtfs_file }}
+      - '-x'
+      - ${{ inputs.osm_file }}
+      - '-m'
+      - ${{ inputs.mot }}
+      - '-o'
+      - ${{ inputs.output_file }}
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