diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e93b0ea4..0be1ff6c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,3 +1,8 @@
+# This configuration is used to build and test on GitHub Actions only.
+# It is not the same configuration that is used by DeepMind to create release binaries.
+# The "official" binaries are built with LLVM/Clang on all platforms, and are linked against libc++
+# on Linux.
+
 name: build
 
 on: