diff --git a/lam/HISTORY b/lam/HISTORY
index 523e192b..c81bbd2d 100644
--- a/lam/HISTORY
+++ b/lam/HISTORY
@@ -1,5 +1,6 @@
 March 2018 6.3
   - Server profile: added option if referential integrity overlay is active to skip cleanup actions
+  - Unix: several options are now specific to subaccount types (reconfiguration required!)
   - LAM Pro:
    -> Support custom structural object classes with new custom type
    -> Support dynamic lists
diff --git a/lam/docs/manual-sources/chapter-installation.xml b/lam/docs/manual-sources/chapter-installation.xml
index f09bd1a5..fdce108f 100644
--- a/lam/docs/manual-sources/chapter-installation.xml
+++ b/lam/docs/manual-sources/chapter-installation.xml
@@ -577,6 +577,10 @@
       <section>
         <title>6.2 -&gt; 6.3</title>
 
+        <para>Unix: Options in server profile for Unix users and groups need
+        to be reconfigured. Several settings (e.g. id generation) are now
+        specific to subaccount type.</para>
+
         <para>Self Service: If you use a captcha for user self registration
         this needs to be reconfigured. On tab General settings please activate
         Google reCAPTCHA (the checkbox to secure login is optional). On tab