From c286727181379dc30aeeebd2ccc768f6f9295182 Mon Sep 17 00:00:00 2001
From: Sandro Santilli <strk@keybit.net>
Date: Wed, 4 Jun 2014 10:16:42 +0200
Subject: [PATCH] Add note about extension needing to be installed before it
 can be upgraded to

---
 README.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/README.md b/README.md
index e64df36..1d16e06 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,9 @@ is done using ALTER EXTENSION.
 ALTER EXTENSION cartodb UPDATE TO '0.1.1';
 ```
 
+The target version needs to be installed on the system first
+(see Install section).
+
 If the "TO 'x.y.z'" part is omitted, the extension will be updated to the
 latest installed version, which you can find with the following command: