diff --git a/SourceGen/MainController.cs b/SourceGen/MainController.cs
index fa23efa..a70b2e9 100644
--- a/SourceGen/MainController.cs
+++ b/SourceGen/MainController.cs
@@ -3952,6 +3952,49 @@ namespace SourceGen {
             showTextDlg.ShowDialog();
         }
 
+        public void Debug_ApplyPlatformSymbols() {
+            ChangeSet cs = new ChangeSet(1);
+
+            foreach (Symbol sym in mProject.SymbolTable) {
+                if (sym.SymbolSource != Symbol.Source.Platform) {
+                    continue;
+                }
+                DefSymbol defSym = (DefSymbol)sym;
+                if (defSym.MultiMask != null) {
+                    // These would require additional work... probably.
+                    continue;
+                }
+
+                int offset = mProject.AddrMap.AddressToOffset(0, sym.Value);
+                if (offset < 0) {
+                    continue;
+                }
+
+                // Make sure this is the start of an instruction or data item.  (If you
+                // haven't finished hinting code, it's best to disable the string/fill finder.)
+                Anattrib attr = mProject.GetAnattrib(offset);
+                if (!attr.IsStart) {
+                    Debug.WriteLine("Found match at non-start +" + offset.ToString("x6") +
+                        ": " + defSym);
+                    continue;
+                }
+
+                // Check for user label.  Okay to overwrite auto label.
+                if (mProject.UserLabels.ContainsKey(offset)) {
+                    Debug.WriteLine("User label already exists at +" + offset.ToString("x6"));
+                    continue;
+                }
+
+                // Create a new user label symbol.
+                Symbol newSym = new Symbol(sym.Label, sym.Value, Symbol.Source.User,
+                    Symbol.Type.GlobalAddr, Symbol.LabelAnnotation.None);
+                UndoableChange uc = UndoableChange.CreateLabelChange(offset, null, newSym);
+                cs.Add(uc);
+            }
+
+            ApplyUndoableChanges(cs);
+        }
+
         #endregion Debug features
     }
 }
diff --git a/SourceGen/RuntimeData/Help/advanced.html b/SourceGen/RuntimeData/Help/advanced.html
index 6861c3a..736ab3b 100644
--- a/SourceGen/RuntimeData/Help/advanced.html
+++ b/SourceGen/RuntimeData/Help/advanced.html
@@ -306,10 +306,10 @@ not help you debug 6502 projects.</p>
 <ul>
   <li>Re-analyze (F5).  Causes a full re-analysis.  Useful if you think
     the display is out of sync.</li>
-  <li>Show Problem List Viewer.  Opens a floating window that shows some
-    of the problems encountered during the last analysis pass.</li>
-  <li>Show Undo/Redo History.  Opens a floating window that lets you
-    watch the contents of the undo buffer while you work.</li>
+  <li>Source Generation Tests.  Opens the regression test harness.  See
+    <code>README.md</code> in the SGTestData directory for more information.
+    If the regression tests weren't included in the SourceGen distribution,
+    this will have nothing to do.</li>
   <li>Show Analyzer Output.  Opens a floating window with a text log from
     the most recent analysis pass.  The exact contents will vary depending
     on how the verbosity level is configured internally.  Debug messages
@@ -318,9 +318,11 @@ not help you debug 6502 projects.</p>
     timer results from the most recent analysis pass.  Times for individual
     stages are noted, as are times for groups of functions.  This
     provides a crude sense of where time is being spent.</li>
+  <li>Show Undo/Redo History.  Opens a floating window that lets you
+    watch the contents of the undo buffer while you work.</li>
   <li>Extension Script Info.  Shows a bit about the currently-loaded
     extension scripts.</li>
-  <li>Toggle Comment Rulers.  Adds a string of digits above every
+  <li>Show Comment Rulers.  Adds a string of digits above every
     multi-line comment (long comment, note).  Useful for confirming that
     the width limitation is being obeyed.  These are added exactly
     as shown, without comment delimiters, into generated assembly output,
@@ -329,10 +331,18 @@ not help you debug 6502 projects.</p>
     script sandbox every 60 seconds.  This seems to be required to avoid
     an infrequently-encountered Windows bug.  (See code for notes and
     stackoverflow.com links.)</li>
-  <li>Source Generation Tests.  Opens the regression test harness.  See
-    the README.md in the SGTestData directory for more information.  If
-    the regression tests weren't included in the SourceGen distribution,
-    this will have nothing to do.</li>
+  <li>Applesoft to HTML.  An experimental feature that formats an
+    Applesoft program as HTML.</li>
+  <li>Apply Platform Symbols.  An experimental feature for turning platform
+    symbols into address labels.  This will run through the list of all
+    symbols loaded from .sym65 files and find addresses that fall within
+    the bounds of the file.  If it finds an address that is the start
+    of a code/data line and doesn't already have a user-supplied label,
+    the platform symbol's label will be applied.  Useful for
+    disassembling ROM images or other code with an established set of
+    public entry points.
+    (Tip: disable "analyze uncategorized data" from the project
+    properties editor first.)</li>
 </ul>
 
 
diff --git a/SourceGen/WpfGui/MainWindow.xaml b/SourceGen/WpfGui/MainWindow.xaml
index 591b7aa..8ad6e77 100644
--- a/SourceGen/WpfGui/MainWindow.xaml
+++ b/SourceGen/WpfGui/MainWindow.xaml
@@ -176,6 +176,7 @@ limitations under the License.
             </RoutedUICommand>
 
             <RoutedUICommand x:Key="Debug_ApplesoftToHtmlCmd" Text="Applesoft to HTML..."/>
+            <RoutedUICommand x:Key="Debug_ApplyPlatformSymbolsCmd" Text="Apply Platform Symbols"/>
             <RoutedUICommand x:Key="Debug_ExtensionScriptInfoCmd" Text="Extension Script Info..."/>
             <RoutedUICommand x:Key="Debug_ShowAnalysisTimersCmd" Text="Show Analysis Timers"/>
             <RoutedUICommand x:Key="Debug_ShowAnalyzerOutputCmd" Text="Show Analyzer Output"/>
@@ -296,6 +297,8 @@ limitations under the License.
                         CanExecute="IsProjectOpen" Executed="Debug_RefreshCmd_Executed"/>
         <CommandBinding Command="{StaticResource Debug_ApplesoftToHtmlCmd}"
                         Executed="Debug_ApplesoftToHtmlCmd_Executed"/>
+        <CommandBinding Command="{StaticResource Debug_ApplyPlatformSymbolsCmd}"
+                        CanExecute="IsProjectOpen" Executed="Debug_ApplyPlatformSymbolsCmd_Executed"/>
         <CommandBinding Command="{StaticResource Debug_ExtensionScriptInfoCmd}"
                         CanExecute="IsProjectOpen" Executed="Debug_ExtensionScriptInfoCmd_Executed"/>
         <CommandBinding Command="{StaticResource Debug_ShowAnalysisTimersCmd}"
@@ -408,6 +411,7 @@ limitations under the License.
                           Command="{StaticResource Debug_ToggleKeepAliveHackCmd}" IsCheckable="True"/>
                 <Separator/>
                 <MenuItem Command="{StaticResource Debug_ApplesoftToHtmlCmd}"/>
+                <MenuItem Command="{StaticResource Debug_ApplyPlatformSymbolsCmd}"/>
             </MenuItem>
         </Menu>
 
diff --git a/SourceGen/WpfGui/MainWindow.xaml.cs b/SourceGen/WpfGui/MainWindow.xaml.cs
index cbdb702..dd64af1 100644
--- a/SourceGen/WpfGui/MainWindow.xaml.cs
+++ b/SourceGen/WpfGui/MainWindow.xaml.cs
@@ -1333,6 +1333,11 @@ namespace SourceGen.WpfGui {
             mMainCtrl.Debug_ApplesoftToHtml();
         }
 
+        private void Debug_ApplyPlatformSymbolsCmd_Executed(object sender,
+                ExecutedRoutedEventArgs e) {
+            mMainCtrl.Debug_ApplyPlatformSymbols();
+        }
+
         private void Debug_ExtensionScriptInfoCmd_Executed(object sender,
             ExecutedRoutedEventArgs e) {
             mMainCtrl.Debug_ExtensionScriptInfo();