diff --git a/tensorflow/docs_src/install/index.md b/tensorflow/docs_src/install/index.md
index 3df16139fb8cdf8a281f6f9ef082f7b203eeaf63..eddbfe9e31e6a3618908ab1966e548873dc6d267 100644
--- a/tensorflow/docs_src/install/index.md
+++ b/tensorflow/docs_src/install/index.md
@@ -1,5 +1,13 @@
 # Installing TensorFlow
 
+We've built and tested TensorFlow on the following 64-bit laptop/desktop
+operating systems:
+  * MacOS X 10.11 (El Capitan) or later.
+  * Ubuntu 14.04 or later
+  * Windows 7 or later.
+Although you might be able to install TensorFlow on other laptop or desktop
+systems, we only support (and only fix issues in) the preceding configurations.
+
 The following guides explain how to install a version of TensorFlow
 that enables you to write applications in Python: