diff --git a/pylast/__init__.py b/pylast/__init__.py
index 35835f8..c1879c7 100644
--- a/pylast/__init__.py
+++ b/pylast/__init__.py
@@ -76,7 +76,8 @@ EVENT_MAYBE_ATTENDING = '1'
 EVENT_NOT_ATTENDING = '2'
 
 PERIOD_OVERALL = 'overall'
-PERIOD_7DAYS = "7day"
+PERIOD_7DAYS = '7day'
+PERIOD_1MONTH = '1month'
 PERIOD_3MONTHS = '3month'
 PERIOD_6MONTHS = '6month'
 PERIOD_12MONTHS = '12month'
@@ -3571,6 +3572,7 @@ class User(_BaseObject, _Chartable):
         * period: The period of time. Possible values:
           o PERIOD_OVERALL
           o PERIOD_7DAYS
+          o PERIOD_1MONTH
           o PERIOD_3MONTHS
           o PERIOD_6MONTHS
           o PERIOD_12MONTHS
@@ -3591,6 +3593,7 @@ class User(_BaseObject, _Chartable):
         * period: The period of time. Possible values:
           o PERIOD_OVERALL
           o PERIOD_7DAYS
+          o PERIOD_1MONTH
           o PERIOD_3MONTHS
           o PERIOD_6MONTHS
           o PERIOD_12MONTHS
@@ -3633,6 +3636,7 @@ class User(_BaseObject, _Chartable):
         * period: The period of time. Possible values:
           o PERIOD_OVERALL
           o PERIOD_7DAYS
+          o PERIOD_1MONTH
           o PERIOD_3MONTHS
           o PERIOD_6MONTHS
           o PERIOD_12MONTHS