diff --git a/README.rst b/README.rst
index 1741a1a..fccd84c 100644
--- a/README.rst
+++ b/README.rst
@@ -5,6 +5,7 @@ Schema migrations are without doubt the most cumbersome and annoying part of wor
 
 But schemas are actually good. Enforcing data consistency and structure is a good thing. It’s the migration tooling that is bad, because it’s harder to use than it should be. ``migra`` is an attempt to change that, and make migrations easy, safe, and reliable instead of something to dread.
 
+**Migra supports PostgreSQL >= 9.4.** Known issues exist with earlier versions.
 
 How it Works
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