diff --git a/README.rst b/README.rst
index a74fd6d9c1..e52b776902 100644
--- a/README.rst
+++ b/README.rst
@@ -142,7 +142,7 @@ Installing prerequisites on openSUSE::
 Installing prerequisites on OpenBSD::
 
     doas pkg_add python libffi py-pip py-setuptools sqlite3 py-virtualenv \
-                 libxslt
+                 libxslt jpeg
 
 To install the Synapse homeserver run::
 
diff --git a/changelog.d/4193.misc b/changelog.d/4193.misc
new file mode 100644
index 0000000000..23d86eab24
--- /dev/null
+++ b/changelog.d/4193.misc
@@ -0,0 +1 @@
+Add missing `jpeg` package prerequisite for OpenBSD in README.