Add a quick doc comment for why the api_docs filegroup is necessary
@@ -2,6 +2,8 @@ package(default_visibility = ["//visibility:public"])
licenses(["notice"]) # Apache 2.0 License
+# This exists for the API doc generator. It needs to exist here because the api_docs directory
+# gets blown away by the tool each time it runs.
filegroup(
name = "api_docs",
srcs = glob(["api_docs/**"]),
