diff --git a/README.md b/README.md
index 425ce21..b98272c 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,7 @@ The plugin has some configuration options even though none are mandatory. This i
 * Host - hostname or IP address of the mongodb server defaults to 127.0.0.1
 * Port - the port of the mongodb server defaults to 27017
 * Database - the databases you want to monitor defaults to "admin". You can provide more than one database. Note that the first database _must_ be "admin", as it is used to perform a serverStatus()
+             "admin" "*" will monitor all databases
 
 The following is an example Collectd configuration for this plugin:
 
diff --git a/mongodb.py b/mongodb.py
index 7ef82de..8049595 100644
--- a/mongodb.py
+++ b/mongodb.py
@@ -1,6 +1,8 @@
 #
 # Plugin to collectd statistics from MongoDB
 #
+# source: https://github.com/sebest/collectd-mongodb
+#
 
 import collectd
 from pymongo import MongoClient
@@ -14,7 +16,7 @@ def __init__(self):
         self.plugin_name = "mongo"
         self.mongo_host = "127.0.0.1"
         self.mongo_port = 27017
-        self.mongo_db = ["admin", ]
+        self.mongo_db = ["admin", "*"]
         self.mongo_user = None
         self.mongo_password = None
 
@@ -141,6 +143,19 @@ def config(self, obj):
             else:
                 collectd.warning("mongodb plugin: Unkown configuration key %s" % node.key)
 
+        if '*' in self.mongo_db:
+            collectd.warning("auto detecting databases.....")
+            con = MongoClient(host=self.mongo_host, port=self.mongo_port, read_preference=ReadPreference.SECONDARY)
+            db = con[self.mongo_db[0]]
+            if self.mongo_user and self.mongo_password:
+                db.authenticate(self.mongo_user, self.mongo_password)
+            db_list=db.command("listDatabases")
+            database_list=[]
+            for d in db_list["databases"]:
+                collectd.warning("db: %s" % str(d['name']))
+                database_list.append(d['name'])
+            self.mongo_db=database_list
+
 mongodb = MongoDB()
 collectd.register_read(mongodb.get_db_and_collection_stats)
 collectd.register_config(mongodb.config)