diff --git a/data/default_config.cfg b/data/default_config.cfg
index 4405164f..9f284f07 100644
--- a/data/default_config.cfg
+++ b/data/default_config.cfg
@@ -249,6 +249,9 @@ use_bookmarks_method =
 # in files.
 #use_log = true
 
+# set to 'false' to not sync the local lgos with the MAM server history
+#mam_sync = true
+
 # The number of lines to preload in a chat buffer when it opens
 # (the lines are preloaded from the log files)
 # 0 or a negative value disable that option
diff --git a/doc/source/configuration.rst b/doc/source/configuration.rst
index 8b364961..f8d04296 100644
--- a/doc/source/configuration.rst
+++ b/doc/source/configuration.rst
@@ -861,6 +861,13 @@ Options related to logging.
 
         Set to ``false`` if you don’t want to write any message to the disk.
 
+    mam_sync
+
+        **Default value:** ``true``
+
+        If ``true``, will try to fill local logs with missing MAM history
+        when opening a tab or joining a room.
+
 Plugins
 ~~~~~~~
 
diff --git a/poezio/config.py b/poezio/config.py
index 713eada7..e98a57c1 100644
--- a/poezio/config.py
+++ b/poezio/config.py
@@ -92,6 +92,7 @@ DEFAULT_CONFIG: ConfigDict = {
         'lazy_resize': True,
         'log_dir': '',
         'log_errors': True,
+        'mam_sync': True,
         'max_lines_in_memory': 2048,
         'max_messages_in_memory': 2048,
         'max_nick_length': 25,