diff --git a/.gitignore b/.gitignore
index 244e179..e39fbab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,21 @@ build/
 
 # Pytest cache
 .pytest_cache/
+
+# macOS
+.DS_Store
+.AppleDouble
+.LSOverride
+._*
+**/.___*
+**/._*
+.Spotlight-V100
+.Trashes
+.fseventsd
+.TemporaryItems
+.AppleDB
+.AppleDesktop
+.apdisk
+Icon?
+.com.apple.timemachine.donotpresent
+.VolumeIcon.icns
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..36b7cd9
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,23 @@
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/pyproject.toml b/pyproject.toml
index 77d929c..8feca8b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,6 +6,8 @@ build-backend = "hatchling.build"
 name = "paperbot"
 version = "0.1.0"
 description = "WG21 C++ paper tracker with ISO draft probing and Slack notifications"
+license = "BSL-1.0"
+license-files = ["LICENSE"]
 requires-python = ">=3.10"
 dependencies = [
     "slack-bolt",