diff --git a/BUILD b/BUILD.bazel
similarity index 100%
rename from BUILD
rename to BUILD.bazel
diff --git a/docs/BUILD b/docs/BUILD.bazel
similarity index 100%
rename from docs/BUILD
rename to docs/BUILD.bazel
diff --git a/docs/style_guide.rst b/docs/style_guide.rst
index e05bde9..e7162df 100644
--- a/docs/style_guide.rst
+++ b/docs/style_guide.rst
@@ -602,3 +602,11 @@
   pw_doc_group("docs") {
     sources = [ "docs.rst" ]
   }
+
+------------------
+Build files: Bazel
+------------------
+
+Similar to their BUILD.gn counterparts, build files for the Bazel build system
+must be named BUILD.bazel. Bazel can interpret files named just BUILD, but we
+use BUILD.bazel to avoid any ambiguity with other build systems or tooling.
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