diff --git a/ldapsync/receivers.py b/ldapsync/receivers.py
index 9eaf36d..a979de8 100644
--- a/ldapsync/receivers.py
+++ b/ldapsync/receivers.py
@@ -5,10 +5,10 @@
 from django.conf import settings
 from django.contrib.auth import get_user_model
 from django.contrib.auth.models import Group
-from django.db.models.signals import post_save
+from django.db.models.signals import m2m_changed, post_save
 from django.dispatch import receiver
 
-from posixusers.models import PosixGroup, PosixUser
+from posixusers.models import PosixGroup, PosixUser, SSHKey
 
 from .utils import sync_group, sync_user
 
@@ -19,6 +19,7 @@ def sync_ldap_user(sender, instance, update_fields=[], **kwargs):
         # skip update if last_login was the only change
         return
     try:
+        print(f"ldapsync user {instance}")
         sync_user(instance)
     except Exception as e:
         print(f"Exception in ldapsync of {instance}: {e}")
@@ -27,6 +28,16 @@ def sync_ldap_user(sender, instance, update_fields=[], **kwargs):
 @receiver(post_save, sender=PosixUser)
 def sync_ldap_posix_user(sender, instance, **kwargs):
     try:
+        print(f"ldapsync user {instance.user} (for PosixUser)")
+        sync_user(instance.user)
+    except Exception as e:
+        print(f"Exception in ldapsync of {instance}: {e}")
+
+
+@receiver(post_save, sender=SSHKey)
+def sync_ldap_posix_sshkey(sender, instance, **kwargs):
+    try:
+        print(f"ldapsync user {instance.user} (for SSHKey)")
         sync_user(instance.user)
     except Exception as e:
         print(f"Exception in ldapsync of {instance}: {e}")
@@ -35,6 +46,7 @@ def sync_ldap_posix_user(sender, instance, **kwargs):
 @receiver(post_save, sender=Group)
 def sync_ldap_group(sender, instance, **kwargs):
     try:
+        print(f"ldapsync group {instance}")
         sync_group(instance)
     except Exception as e:
         print(f"Exception in ldapsync of {instance}: {e}")
@@ -43,6 +55,27 @@ def sync_ldap_group(sender, instance, **kwargs):
 @receiver(post_save, sender=PosixGroup)
 def sync_ldap_posix_group(sender, instance, **kwargs):
     try:
+        print(f"ldapsync user {instance.group} (for PosixGroup)")
         sync_group(instance.group)
     except Exception as e:
         print(f"Exception in ldapsync of {instance}: {e}")
+
+
+@receiver(m2m_changed, sender=Group.user_set.through)
+def sync_ldap_group_m2m(sender, instance, *, action=None, **kwargs):
+    if action in ["post_add", "post_remove"]:
+        try:
+            print(f"ldapsync group {instance} (for membership)")
+            sync_group(instance)
+        except Exception as e:
+            print(f"Exception in ldapsync of {instance}: {e}")
+
+
+# @receiver(post_save)
+# def test_post_save(sender, instance, **kwargs):
+#     print(f"POST_SAVE sender={sender} instance={instance} kwargs={kwargs}")
+
+
+# @receiver(m2m_changed)
+# def test_m2m_changed(sender, instance, **kwargs):
+#     print(f"M2M_CHANGED sender={sender} instance={instance} kwargs={kwargs}")