diff --git a/Lib/queue.py b/Lib/queue.py
index c3296fe1382..3cee36b8961 100644
--- a/Lib/queue.py
+++ b/Lib/queue.py
@@ -120,7 +120,7 @@ class Queue:
 
         If optional args 'block' is true and 'timeout' is None (the default),
         block if necessary until a free slot is available. If 'timeout' is
-        a positive number, it blocks at most 'timeout' seconds and raises
+        a non-negative number, it blocks at most 'timeout' seconds and raises
         the Full exception if no free slot was available within that time.
         Otherwise ('block' is false), put an item on the queue if a free slot
         is immediately available, else raise the Full exception ('timeout'
@@ -135,7 +135,7 @@ class Queue:
                     while self._qsize() >= self.maxsize:
                         self.not_full.wait()
                 elif timeout < 0:
-                    raise ValueError("'timeout' must be a positive number")
+                    raise ValueError("'timeout' must be a non-negative number")
                 else:
                     endtime = time() + timeout
                     while self._qsize() >= self.maxsize:
@@ -152,7 +152,7 @@ class Queue:
 
         If optional args 'block' is true and 'timeout' is None (the default),
         block if necessary until an item is available. If 'timeout' is
-        a positive number, it blocks at most 'timeout' seconds and raises
+        a non-negative number, it blocks at most 'timeout' seconds and raises
         the Empty exception if no item was available within that time.
         Otherwise ('block' is false), return an item if one is immediately
         available, else raise the Empty exception ('timeout' is ignored
@@ -166,7 +166,7 @@ class Queue:
                 while not self._qsize():
                     self.not_empty.wait()
             elif timeout < 0:
-                raise ValueError("'timeout' must be a positive number")
+                raise ValueError("'timeout' must be a non-negative number")
             else:
                 endtime = time() + timeout
                 while not self._qsize():
diff --git a/Misc/ACKS b/Misc/ACKS
index 77179418846..be7abdbbf40 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -773,6 +773,7 @@ Ray Loyzaga
 Lukas Lueg
 Loren Luke
 Fredrik Lundh
+Zhongyue Luo
 Mark Lutz
 Taras Lyapun
 Jim Lynch
diff --git a/Misc/NEWS b/Misc/NEWS
index d8476625e9b..a9f2b8b3309 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -24,6 +24,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #18676: Change 'positive' to 'non-negative' in queue.py put and get
+  docstrings and ValueError messages. Patch by Zhongyue Luo
+
 - Fix refcounting issue with extension types in tkinter.
 
 - Issue #8112: xlmrpc.server's DocXMLRPCServer server no longer raises an error
@@ -826,7 +829,7 @@ Windows
 Build
 -----
 
-- Issue #16067: Add description into MSI file to replace installer's 
+- Issue #16067: Add description into MSI file to replace installer's
   temporary name.
 
 - Issue #18257: Fix readlink usage in python-config.  Install the python