1 files changed, 6 insertions, 0 deletions
diff --git a/README.md b/README.md
index a24fb15..f9e695a 100644
--- a/README.md
+++ b/README.md
@@ -102,3 +102,9 @@ Makefile should define two variables:
 
 For example see "examples/symlinks".
 
+## copy.mk
+
+If this module is included, entire source tree will be copied
+into all requested building directories. This is useful for
+packages that do not support building out of source tree,
+such as zlib or openssl.