diff --git a/changelogs/client_server/newsfragments/1266.clarification b/changelogs/client_server/newsfragments/1266.clarification
new file mode 100644
index 00000000..ad9a0d27
--- /dev/null
+++ b/changelogs/client_server/newsfragments/1266.clarification
@@ -0,0 +1 @@
+Fix naming of `device_one_time_keys_count` in `/sync`.
diff --git a/content/client-server-api/modules/end_to_end_encryption.md b/content/client-server-api/modules/end_to_end_encryption.md
index 10f21e86..3deae943 100644
--- a/content/client-server-api/modules/end_to_end_encryption.md
+++ b/content/client-server-api/modules/end_to_end_encryption.md
@@ -1622,7 +1622,7 @@ specified). The client is expected to use [`/keys/query`](/client-server-api/#po
 sync, as documented in [Tracking the device list for a
 user](#tracking-the-device-list-for-a-user).
 
-It also adds a `one_time_keys_count` property. Note the spelling
+It also adds a `device_one_time_keys_count` property. Note the spelling
 difference with the `one_time_key_counts` property in the
 [`/keys/upload`](/client-server-api/#post_matrixclientv3keysupload) response.