diff --git a/README.md b/README.md
index 08cbf4e..90e4b22 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,7 @@ neat. Note: This is a beta release, so the interface is not yet stable.
 ### Runtime Dependencies
  * pixman
  * aml - https://github.com/any1/aml/
+ * zlib
  * gnutls (optional)
  * libturbojpeg (optional)