diff --git a/mercurial/help.py b/mercurial/help.py
--- a/mercurial/help.py
+++ b/mercurial/help.py
@@ -391,6 +391,12 @@
     single documentation block and use it to overwrite the marker in doc.
     """
     entries = []
+    markerindent = 0
+    markerpos = doc.find(marker)
+    if markerpos >= 0:
+        newlinepos = doc.rfind('\n', 0, markerpos)
+        if newlinepos >= 0:
+            markerindent = markerpos - newlinepos - 1
     for name in sorted(items):
         text = (pycompat.getdoc(items[name]) or '').rstrip()
         if (not text
@@ -407,7 +413,7 @@
             if l.strip().startswith('>>>'):
                 break
             if dedent:
-                doclines.append(l.rstrip())
+                doclines.append(markerindent * ' ' + l.rstrip())
             else:
                 doclines.append('  ' + l.strip())
         entries.append('\n'.join(doclines))
diff --git a/mercurial/help/hgweb.txt b/mercurial/help/hgweb.txt
--- a/mercurial/help/hgweb.txt
+++ b/mercurial/help/hgweb.txt
@@ -83,4 +83,4 @@
 
 The following web commands and their URLs are available:
 
-  .. webcommandsmarker
+.. webcommandsmarker