diff --git a/src/calibre/debug.py b/src/calibre/debug.py
index bcce19e160..1a830d4a3e 100644
--- a/src/calibre/debug.py
+++ b/src/calibre/debug.py
@@ -89,7 +89,11 @@ as a shebang in scripts, like this:
             ' be asked for the export folder and the libraries to export. You can also specify them'
             ' as command line arguments to skip the questions.'
             ' Use absolute paths for the export folder and libraries.'
-            ' The special keyword "all" can be used to export all libraries.'))
+            ' The special keyword "all" can be used to export all libraries. Examples:\n\n'
+            '  calibre-debug --export-all-calibre-data  # for interactive use\n'
+            '  calibre-debug --export-all-calibre-data /path/to/empty/export/folder /path/to/library/folder1 /path/to/library2\n'
+            '  calibre-debug --export-all-calibre-data /export/folder all  # export all known libraries'
+    ))
     parser.add_option('--import-calibre-data', default=False, action='store_true',
         help=_('Import previously exported calibre data'))
     parser.add_option('-s', '--shutdown-running-calibre', default=False,