diff --git a/rbtools/postreview.py b/rbtools/postreview.py
index f80c2dffcebcf09b4004e87ed41ffbe17778dfd6..55cb5b9a923996baff40d8e148e4b6b05701a758 100755
--- a/rbtools/postreview.py
+++ b/rbtools/postreview.py
@@ -1272,6 +1272,10 @@ def main():
     else:
         homepath = ''
 
+    sys.stderr.write('The "post-review" tool is deprecated in favor of the'
+                     '"rbt" suite of commands. post-review will go away in '
+                     'RBTools 0.6.x.\n')
+
     # If we end up creating a cookie file, make sure it's only readable by the
     # user.
     os.umask(0077)