diff --git a/docs/backends/eveonline.rst b/docs/backends/eveonline.rst
index 4b741203..b0b814df 100644
--- a/docs/backends/eveonline.rst
+++ b/docs/backends/eveonline.rst
@@ -35,4 +35,24 @@ The EVE Single Sign-On (SSO) works similar to GitHub (OAuth2).
 
       SOCIAL_AUTH_EVEONLINE_SCOPE = ['publicData']
 
+Character transfers
+-------------------
+
+EVE characters can move between player accounts. This backend checks the
+``CharacterOwnerHash`` returned by EVE SSO against the hash saved with an
+existing ``CharacterID`` association. If the hashes differ, sign-in fails with
+``identity_in_use``; the transferred character cannot access the previous
+owner's local account.
+
+To let the new owner sign in, an administrator must verify the transfer and
+remove the old social-auth association. The new owner can then sign in with the
+character and create or link their own local account. Preserve access to any
+other identities and data on the previous owner's local account when removing
+the association.
+
+An older association without a saved ``owner_hash`` records the hash from its
+next successful sign-in. Because that row has no evidence of the previous
+owner, review such rows before relying on this backfill in sensitive
+deployments. Sign-in fails if EVE SSO omits ``CharacterOwnerHash``.
+
 .. _EVE Developers: https://developers.eveonline.com/