diff --git a/Troubleshooting.md b/Troubleshooting.md
index 25edd01..e33e22a 100644
--- a/Troubleshooting.md
+++ b/Troubleshooting.md
@@ -63,6 +63,7 @@ Then to add it back :GenTocRedCarpet
     * [Error: User not found](#error-user-not-found)
     * [Error: Missing credentials](#error-missing-credentials)
     * [Frontier CAPI query failure: /profile (or /market, or /shipyard)](#frontier-capi-query-failure-profile-or-market-or-shipyard)
+    * [I sync Journals between two or more computers, and have to re-auth on each switch](#i-sync-journals-between-two-or-more-computers-and-have-to-re-auth-on-each-switch)
     * [Chrome complains after approving on Frontier's site](#chrome-complains-after-approving-on-frontier-39-s-site)
 * [Third Party Site Plugins (EDSM, EDDB, Inara)](#third-party-site-plugins-edsm-eddb-inara)
     * [Credentials settings are greyed out](#credentials-settings-are-greyed-out)
@@ -642,6 +643,36 @@ Frontier's end.
 
 <!-- vim-markdown-toc Redcarpet -->
 
+<a name='i-sync-journals-between-two-or-more-computers-and-have-to-re-auth-on-each-switch'></a>
+
+<!-- vim-markdown-toc -->
+## I sync Journals between two or more computers, and have to re-auth on each switch
+Ref: [#1632: EDMC needs to re-authenticate every time I switch computers](https://github.com/EDCD/EDMarketConnector/issues/1632)
+
+For a single game account combined with a single 'Client Id' only *one*
+authorisation can be active at a time.
+
+What this means in practice is that if
+you authenticate on Computer A for Account A with respect to Client A (i.e. 
+EDMC), then EDMC stores the 'Refresh Token' for future use, and refreshes it
+to the new value when used.
+
+If you then authenticate, for Account A with respect to the same ClientA, but
+on Computer B, then you will get a  *different* Refresh Token, and the one that
+Computer A has stored will now be invalid.
+
+Result: Each time you (re-)authenticate on one computer you will be 
+invalidating tthe other computer's authorization, and the next time it needs
+to obtain a new Access Token you will be forced to re-authenticate.
+
+The only workaround for this would be to synchronise the Registry entry:
+
+    Computer\HKEY_CURRENT_USER\SOFTWARE\Marginal\EDMarketConnector\fdev_apikeys
+
+between the two computers.
+
+<!-- vim-markdown-toc Redcarpet -->
+
 <a name='chrome-complains-after-approving-on-frontier-39-s-site'></a>
 
 <!-- vim-markdown-toc -->