1 files changed, 9 insertions, 1 deletions
diff --git a/redis/client.py b/redis/client.py
index 160f495..ea36ef0 100755
--- a/redis/client.py
+++ b/redis/client.py
@@ -2866,7 +2866,8 @@ class Redis:
         return self.execute_command('XTRIM', name, *pieces)
 
     # SORTED SET COMMANDS
-    def zadd(self, name, mapping, nx=False, xx=False, ch=False, incr=False):
+    def zadd(self, name, mapping, nx=False, xx=False, ch=False, incr=False,
+             gt=None, lt=None):
         """
         Set any number of element-name, score pairs to the key ``name``. Pairs
         are specified as a dict of element-names keys to score values.
@@ -2897,6 +2898,9 @@ class Redis:
         if incr and len(mapping) != 1:
             raise DataError("ZADD option 'incr' only works when passing a "
                             "single element/score pair")
+        if nx is True and (gt is not None or lt is not None):
+            raise DataError("Only one of 'nx', 'lt', or 'gr' may be defined.")
+
         pieces = []
         options = {}
         if nx:
@@ -2908,6 +2912,10 @@ class Redis:
         if incr:
             pieces.append(b'INCR')
             options['as_score'] = True
+        if gt:
+            pieces.append(b'GT')
+        if lt:
+            pieces.append(b'LT')
         for pair in mapping.items():
             pieces.append(pair[1])
             pieces.append(pair[0])