diff --git a/INSTALL.md b/INSTALL.md

index 598ddceb8c..656833637c 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -257,7 +257,7 @@ for a number of platforms.
 
 #### Docker images and Ansible playbooks
 
-There is an offical synapse image available at
+There is an official synapse image available at
 <https://hub.docker.com/r/matrixdotorg/synapse> which can be used with
 the docker-compose file available at [contrib/docker](contrib/docker). Further
 information on this including configuration options is available in the README
diff --git a/changelog.d/9040.doc b/changelog.d/9040.doc
new file mode 100644

index 0000000000..5c1f7be781
--- /dev/null
+++ b/changelog.d/9040.doc
@@ -0,0 +1 @@
+Corrected a typo in `INSTALL.md`.