diff --git a/changelogs/client_server/newsfragments/2389.clarification b/changelogs/client_server/newsfragments/2389.clarification
new file mode 100644
index 00000000..3ccb2333
--- /dev/null
+++ b/changelogs/client_server/newsfragments/2389.clarification
@@ -0,0 +1 @@
+Fix various typos throughout the specification.
diff --git a/data/api/client-server/cross_signing.yaml b/data/api/client-server/cross_signing.yaml
index 6a725295..13507718 100644
--- a/data/api/client-server/cross_signing.yaml
+++ b/data/api/client-server/cross_signing.yaml
@@ -203,8 +203,8 @@ paths:
                     "user_id": "@alice:example.com",
                     "device_id": "HIJKLMN",
                     "algorithms": [
-                      "m.olm.v1.curve25519-aes-sha256",
-                      "m.megolm.v1.aes-sha"
+                      "m.olm.v1.curve25519-aes-sha2",
+                      "m.megolm.v1.aes-sha2"
                     ],
                     "keys": {
                       "curve25519:HIJKLMN": "base64+curve25519+key",