diff --git a/README.md b/README.md
index d8cc1ec1..83896575 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,9 @@ sudo pacman -S openssl
 
 OpenSSL 0.9.8 is preinstalled on OSX. Some features are only available when
 linking against OpenSSL 1.0.0 or greater; see below on how to point
-rust-openssl to a separate installation.
+rust-openssl to a separate installation. OSX releases starting at 10.11, "El
+Capitan", no longer include OpenSSL headers which will prevent the `openssl`
+crate from compiling.
 
 ### Windows