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diff --git a/doc/manual/style.txt b/doc/manual/style.txt
index b4d02165..71bb5f6b 100644
--- a/doc/manual/style.txt
+++ b/doc/manual/style.txt
@@ -80,6 +80,9 @@ Finally, try to avoid lines of code that are longer than than 72-80 columns:
- designated initializers (@{ .field = value @})
- variables declarations should occur at the point of first use
- new block scopes for selection and iteration statements
+- use malloc() to create dynamic arrays. Do @b not use @c alloca
+or variable length arrays on the stack. non-MMU hosts(uClinux) and
+pthreads require modest and predictable stack usage.
@section styletypes Type Guidelines
- use native types (@c int or @c unsigned) if the type is not important