diff --git a/docs/README.macOS b/docs/README.macOS
new file mode 100644
index 000000000..d9fbb6bd9
--- /dev/null
+++ b/docs/README.macOS
@@ -0,0 +1,7 @@
+Starting with "El Capitan" Apple removed the openssl headers. Therefore it's
+required to build openssl manually upfront. For example by using MacPorts or Homebrew.
+To build FreeRDP against this library it's required to set the PKG_CONFIG_PATH
+pointing to the openssl root directory befor building.
+For example with brew it would look like this:
+
+export PKG_CONFIG_PATH=$(brew --prefix)/opt/openssl/lib/pkgconfig