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-rw-r--r--UPGRADE.rst14
1 files changed, 12 insertions, 2 deletions
diff --git a/UPGRADE.rst b/UPGRADE.rst
index 9562114d59..5ebf16a73e 100644
--- a/UPGRADE.rst
+++ b/UPGRADE.rst
@@ -2,7 +2,7 @@ Upgrading Synapse
 =================
 
 Before upgrading check if any special steps are required to upgrade from the
-what you currently have installed to current version of Synapse. The extra
+version you currently have installed to the current version of Synapse. The extra
 instructions that may be required are listed later in this document.
 
 * If Synapse was installed using `prebuilt packages
@@ -29,7 +29,7 @@ instructions that may be required are listed later in this document.
      running:
 
      .. code:: bash
-     
+
        git pull
        pip install --upgrade .
 
@@ -75,6 +75,16 @@ for example:
      wget https://packages.matrix.org/debian/pool/main/m/matrix-synapse-py3/matrix-synapse-py3_1.3.0+stretch1_amd64.deb
      dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
 
+
+Upgrading to v1.5.0
+===================
+
+This release includes a database migration which may take several minutes to
+complete if there are a large number (more than a million or so) of entries in
+the ``devices`` table. This is only likely to a be a problem on very large
+installations.
+
+
 Upgrading to v1.4.0
 ===================