diff --git a/src/calibre/debug.py b/src/calibre/debug.py
index 403e9a20e3..2f8b604511 100644
--- a/src/calibre/debug.py
+++ b/src/calibre/debug.py
@@ -174,6 +174,10 @@ def print_basic_debug_info(out=None):
             out('Linux:', platform.linux_distribution())
     except:
         pass
+    from calibre.customize.ui import has_external_plugins, initialized_plugins
+    if has_external_plugins():
+        names = (p.name for p in initialized_plugins() if getattr(p, 'plugin_path', None) is not None)
+        out('Successfully initialized third party plugins:', ' && '.join(names))
 
 def run_debug_gui(logpath):
     import time