diff --git a/STYLE.md b/STYLE.md
index 4b377e71..3c74b45c 100644
--- a/STYLE.md
+++ b/STYLE.md
@@ -207,3 +207,14 @@ return value patterns in legacy functions.
 
 Document private functions in their `internal.h` header or, if static,
 where defined.
+
+
+## Build logic
+
+BoringSSL is used by many projects with many different build tools.
+Reimplementing and maintaining build logic in each downstream build is
+cumbersome, so build logic should be avoided where possible. Platform-specific
+files should be excluded by wrapping the contents in `#ifdef`s, rather than
+computing platform-specific file lists. Generated source files such as perlasm
+and `err_data.c` may be used in the standalone CMake build but, for downstream
+builds, they should be pre-generated in `generate_build_files.py`.