diff --git a/README.md b/README.md
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+++ b/README.md
@@ -1,3 +1,19 @@
 # blender-mapping-tools
 
-Blender extension for creating maps
\ No newline at end of file
+Blender extension for creating maps
+
+## Building
+
+TODO: make a proper build system.
+
+For Blender 4.4:
+
+```sh
+pip download rasterio --dest ./wheels --only-binary==:all: --python-version=3.11
+# Or replcace ".." below with any directory.
+# blender_mapping_tools-0.1.0.zip will be placed in that directory.
+blender --command extension build --output-dir ..
+```
+
+Then install `blender_mapping_tools-0.1.0.zip` as an extension in blender. It
+will add a "Mesh from GeoTIFF" option to the "Add" menu.