diff --git a/src/extra/booster.json b/src/extra/booster/booster.json
similarity index 100%
rename from src/extra/booster.json
rename to src/extra/booster/booster.json
diff --git a/src/extra/booster/booster0.5.0.tar.xz b/src/extra/booster/booster0.5.0.tar.xz
new file mode 100644
index 0000000..18a13fb
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diff --git a/src/extra/booster_template.ods b/src/extra/booster/booster_template.ods
similarity index 100%
rename from src/extra/booster_template.ods
rename to src/extra/booster/booster_template.ods
diff --git a/src/extra/dds_for_booster.py b/src/extra/booster/dds_for_booster.py
similarity index 100%
rename from src/extra/dds_for_booster.py
rename to src/extra/booster/dds_for_booster.py
diff --git a/src/extra/booster/kasli-booster.zip b/src/extra/booster/kasli-booster.zip
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diff --git a/src/hw/booster.md b/src/hw/booster.md
index a67a00c..f69d4fe 100644
--- a/src/hw/booster.md
+++ b/src/hw/booster.md
@@ -10,8 +10,8 @@
 
 #### Easier way
 
+Download and unpack the [booster firmware](../extra/booster/booster0.5.0.tar.xz), and then:
 ```shell
-# download binary from https://files.m-labs.hk/s/DcJwdC33tyBK7at
 nix-shell -p dfu-util
 dfu-util -a 0 -s 0x08000000:leave --download booster0.5.0.bin
 ```