diff --git a/lib/nntp/tiny/response.py b/lib/nntp/tiny/response.py
index bf56812..4e730fb 100644
--- a/lib/nntp/tiny/response.py
+++ b/lib/nntp/tiny/response.py
@@ -29,7 +29,7 @@ class ResponseCode(enum.Enum):
     NNTP_ARTICLE_INVALID_NUMBER        = 420
     NNTP_ARTICLE_NO_NEXT               = 421
     NNTP_ARTICLE_NO_PREVIOUS           = 422
-    NNTP_ARTICLE_NOT_FOUND_NUM         = 423
+    NNTP_ARTICLE_NOT_FOUND_RANGE       = 423
     NNTP_ARTICLE_NOT_FOUND_ID          = 430
     NNTP_POST_PROHIBITED               = 440
     NNTP_POST_FAILED                   = 441
@@ -61,7 +61,7 @@ class ResponseCode(enum.Enum):
             420: "Current article number is invalid",
             421: "No next article in this group",
             422: "No previous article in this group",
-            423: "No article found by that number",
+            423: "No articles found within range",
             430: "No article found by that message ID",
             440: "Posting prohibited",
             441: "Posting failed",
diff --git a/lib/nntp/tiny/session.py b/lib/nntp/tiny/session.py
index 3dc18d3..c4e3d3a 100644
--- a/lib/nntp/tiny/session.py
+++ b/lib/nntp/tiny/session.py
@@ -617,7 +617,7 @@ class Session():
             row = cr.fetchone()
 
             if row is None:
-                return self.respond(ResponseCode.NNTP_ARTICLE_NOT_FOUND_NUM)
+                return self.respond(ResponseCode.NNTP_ARTICLE_NOT_FOUND_RANGE)
 
         text = "%d %s" % (row[0], row[1])