diff --git a/doc/data/messages/b/bad-open-mode/bad.py b/doc/data/messages/b/bad-open-mode/bad.py
new file mode 100644
index 0000000000..28cfb62283
--- /dev/null
+++ b/doc/data/messages/b/bad-open-mode/bad.py
@@ -0,0 +1,3 @@
+def foo(file_path):
+    with open(file_path, "rwx") as file:  # [bad-open-mode]
+        contents = file.read()
diff --git a/doc/data/messages/b/bad-open-mode/good.py b/doc/data/messages/b/bad-open-mode/good.py
new file mode 100644
index 0000000000..64a853b38c
--- /dev/null
+++ b/doc/data/messages/b/bad-open-mode/good.py
@@ -0,0 +1,3 @@
+def foo(file_path):
+    with open(file_path, "r") as file:
+        contents = file.read()
diff --git a/doc/data/messages/u/unspecified-encoding/bad.py b/doc/data/messages/u/unspecified-encoding/bad.py
new file mode 100644
index 0000000000..4645923c58
--- /dev/null
+++ b/doc/data/messages/u/unspecified-encoding/bad.py
@@ -0,0 +1,3 @@
+def foo(file_path):
+    with open(file_path) as file:  # [unspecified-encoding]
+        contents = file.read()
diff --git a/doc/data/messages/u/unspecified-encoding/good.py b/doc/data/messages/u/unspecified-encoding/good.py
new file mode 100644
index 0000000000..a267a36070
--- /dev/null
+++ b/doc/data/messages/u/unspecified-encoding/good.py
@@ -0,0 +1,3 @@
+def foo(file_path):
+    with open(file_path, encoding="utf-8") as file:
+        contents = file.read()
diff --git a/pylint/checkers/stdlib.py b/pylint/checkers/stdlib.py
index 5b4670803e..5d3ef41b5b 100644
--- a/pylint/checkers/stdlib.py
+++ b/pylint/checkers/stdlib.py
@@ -363,7 +363,7 @@ class StdlibChecker(DeprecatedMixin, BaseChecker):
             "bad-open-mode",
             "Python supports: r, w, a[, x] modes with b, +, "
             "and U (only with r) options. "
-            "See https://docs.python.org/2/library/functions.html#open",
+            "See https://docs.python.org/3/library/functions.html#open",
         ),
         "W1502": (
             "Using datetime.time in a boolean context.",