diff --git a/doc/install-on-macosx.md b/doc/install-on-macosx.md
index 3c30c1e46..d55f82644 100644
--- a/doc/install-on-macosx.md
+++ b/doc/install-on-macosx.md
@@ -1,6 +1,6 @@
 # Installation on Mac OS X
 
-Ray must currently be built from source.
+Ray must currently be built from source. We have tested Ray on OS X 10.11.
 
 ## Clone the Ray repository
 
diff --git a/doc/install-on-ubuntu.md b/doc/install-on-ubuntu.md
index 47a7f05f3..fe7fff34d 100644
--- a/doc/install-on-ubuntu.md
+++ b/doc/install-on-ubuntu.md
@@ -1,6 +1,6 @@
 # Installation on Ubuntu
 
-Ray must currently be built from source.
+Ray must currently be built from source. We have tested Ray on Ubuntu 14.04.
 
 ## Clone the Ray repository