diff --git a/docker/api/container.py b/docker/api/container.py
index 2dca68a1..326e7679 100644
--- a/docker/api/container.py
+++ b/docker/api/container.py
@@ -502,6 +502,7 @@ class ContainerApiMixin(object):
                 bytes) or a string with a units identification char
                 (``100000b``, ``1000k``, ``128m``, ``1g``). If a string is
                 specified without a units character, bytes are assumed as an
+            mem_reservation (int or str): Memory soft limit.
             mem_swappiness (int): Tune a container's memory swappiness
                 behavior. Accepts number between 0 and 100.
             memswap_limit (str or int): Maximum amount of memory + swap a
diff --git a/docker/models/containers.py b/docker/models/containers.py
index d321a580..999851ec 100644
--- a/docker/models/containers.py
+++ b/docker/models/containers.py
@@ -618,7 +618,7 @@ class ContainerCollection(Collection):
                 (``100000b``, ``1000k``, ``128m``, ``1g``). If a string is
                 specified without a units character, bytes are assumed as an
                 intended unit.
-            mem_reservation (int or str): Memory soft limit
+            mem_reservation (int or str): Memory soft limit.
             mem_swappiness (int): Tune a container's memory swappiness
                 behavior. Accepts number between 0 and 100.
             memswap_limit (str or int): Maximum amount of memory + swap a