diff --git a/README.md b/README.md
index bce4d0e..bc8d1c7 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ Two  zeroth-order optimization methods are implemented in ZOOclient release 0.1,
 
 ## Installation
 
-If you have not done so already, [download and install Julia](http://julialang.org/downloads/) (Any version starting with 0.6 should be fine)
+If you have not done so already, [download and install Julia](http://julialang.org/downloads/) (Any version starting with 0.6 should be fine.  ZOOclient is not compatible with julia 1.0 temporarily. )
 
 To install ZOOclient, start Julia and run:
 
diff --git a/REQUIRE b/REQUIRE
index 8c7ae74..21b53a7 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -1 +1,2 @@
+julia 0.6
 PyPlot
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