diff --git a/docs/installation.rst b/docs/installation.rst
index 56dfc09db..4ba14d6f1 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -51,10 +51,16 @@ Many of Pillow's features require external libraries:
 
 * **libjpeg** provides JPEG functionality.
 
-  * Pillow has been tested with libjpeg versions **6b**, **8**, and **9** and libjpeg-turbo version **8**.
+  * Pillow has been tested with libjpeg versions **6b**, **8**, and
+    **9** and libjpeg-turbo version **8**.
+  * Starting with Pillow 3.0.0, libjpeg is required by default, but
+    may be disabled with the `--disable-jpeg` flag.
 
 * **zlib** provides access to compressed PNGs
 
+  * Starting with Pillow 3.0.0, zlib is required by default, but may
+    be disabled with the `--disable-zlib` flag.
+
 * **libtiff** provides compressed TIFF functionality
 
   * Pillow has been tested with libtiff versions **3.x** and **4.0**