diff --git a/content/docs/analyzers/LinterCop/LC0054.md b/content/docs/analyzers/LinterCop/LC0054.md
index 8b12f58..f06d3ec 100644
--- a/content/docs/analyzers/LinterCop/LC0054.md
+++ b/content/docs/analyzers/LinterCop/LC0054.md
@@ -30,7 +30,7 @@ interface IPaymentProcessor
 
 ### Prefixes
 
-Setting `mandatoryAffixes` or `mandatoryPrefix` in the `AppSourceCop.json` file enables this rule to handle prefixes. The AppSourceCop analyzer itself does not need to be activated — the configuration file is used solely to retrieve affixes, preventing duplicate setup for AppSource development scenarios.
+Setting `mandatoryAffixes`, `mandatoryPrefix`, or `mandatorySuffix` in the `AppSourceCop.json` file enables this rule to handle prefixes. Every configured value is accepted as a leading affix, matching the loose semantics of AppSourceCop itself. The AppSourceCop analyzer does not need to be activated — the configuration file is used solely to retrieve affixes, preventing duplicate setup for AppSource development scenarios.
 
 {{< highlight al "hl_lines=1" >}}
 interface "ABC ISubscriber"
diff --git a/content/docs/analyzers/PlatformCop/PC0021.md b/content/docs/analyzers/PlatformCop/PC0021.md
index 6cb3122..d4b4c6f 100644
--- a/content/docs/analyzers/PlatformCop/PC0021.md
+++ b/content/docs/analyzers/PlatformCop/PC0021.md
@@ -99,6 +99,32 @@ table 50101 "Posted Sales Document"
 }
 {{< /highlight >}}
 
+### Mandatory affixes
+
+When `mandatoryPrefix`, `mandatorySuffix`, or `mandatoryAffixes` are configured in `AppSourceCop.json`, field names on your own table extensions must carry an affix — forcing them to differ from a paired base-table field. This rule strips those affixes before comparing names, so a compliant extension field does not trigger a false positive. The AppSourceCop analyzer itself does not need to be activated — the configuration file is used solely to retrieve affixes.
+
+{{< highlight al >}}
+tableextension 50100 "ABC Sales Document" extends "Sales Document"
+{
+    fields
+    {
+        field(50100; "ABC Discount Amount"; Decimal) { }
+    }
+}
+
+tableextension 50101 "ABC Posted Sales Document" extends "Posted Sales Document"
+{
+    fields
+    {
+        field(50100; "ABC Discount Amount"; Decimal) { }
+    }
+}
+{{< /highlight >}}
+
+With `"mandatoryPrefix": "ABC "` configured, the names are compared without the affix and no diagnostic is reported.
+
+Affix stripping applies only to fields declared on table extensions in your own app. Fields on your own tables are not stripped: there the affix belongs on the table object, not on each field.
+
 ### See also
 
 - [PC0020](pc0020/) — Incompatible field types across TransferFields