diff --git a/doc/source/timeseries.rst b/doc/source/timeseries.rst
index 466c48b780861..58d3cb1091f97 100644
--- a/doc/source/timeseries.rst
+++ b/doc/source/timeseries.rst
@@ -1155,6 +1155,8 @@ frequencies. We will refer to these aliases as *offset aliases*.
     "L, ms", "milliseconds"
     "U, us", "microseconds"
     "N", "nanoseconds"
+    "WOM, "x-th day of the y-th week of each month frequency"
+    "LWOM", "x-th day of the last week of each month frequency"
 
 Combining Aliases
 ~~~~~~~~~~~~~~~~~
diff --git a/pandas/tseries/offsets.py b/pandas/tseries/offsets.py
index 2e4be7fbdeebf..7758d48009436 100644
--- a/pandas/tseries/offsets.py
+++ b/pandas/tseries/offsets.py
@@ -2451,23 +2451,29 @@ def generate_range(start=None, end=None, periods=None,
 
 
 prefix_mapping = dict((offset._prefix, offset) for offset in [
-    YearBegin,                 # 'AS'
     YearEnd,                   # 'A'
-    BYearBegin,                # 'BAS'
-    BYearEnd,                  # 'BA'
+    YearBegin,                 # 'AS'
     BusinessDay,               # 'B'
+    BYearEnd,                  # 'BA'
+    BYearBegin,                # 'BAS'
+    BusinessHour,              # 'BH'
     BusinessMonthBegin,        # 'BMS'
     BusinessMonthEnd,          # 'BM'
     BQuarterEnd,               # 'BQ'
     BQuarterBegin,             # 'BQS'
-    BusinessHour,              # 'BH'
     CustomBusinessDay,         # 'C'
+    CustomBusinessHour,        # 'CBH'
     CustomBusinessMonthEnd,    # 'CBM'
     CustomBusinessMonthBegin,  # 'CBMS'
-    CustomBusinessHour,        # 'CBH'
+    Day,                       # 'D'
+    Hour,                      # 'H'
+    Milli,                     # 'L'
+    LastWeekOfMonth,           # 'LWOM'
     MonthEnd,                  # 'M'
     MonthBegin,                # 'MS'
     Nano,                      # 'N'
+    FY5253,                    # 'RE'
+    FY5253Quarter,             # 'REQ'
     SemiMonthEnd,              # 'SM'
     SemiMonthBegin,            # 'SMS'
     Week,                      # 'W'
@@ -2476,10 +2482,5 @@ def generate_range(start=None, end=None, periods=None,
     Micro,                     # 'U'
     QuarterEnd,                # 'Q'
     QuarterBegin,              # 'QS'
-    Milli,                     # 'L'
-    Hour,                      # 'H'
-    Day,                       # 'D'
     WeekOfMonth,               # 'WOM'
-    FY5253,
-    FY5253Quarter,
 ])