diff --git a/changelog/fix_incorrect_documentation_urls.md b/changelog/fix_incorrect_documentation_urls.md
new file mode 100644
index 0000000000..f4b56fc579
--- /dev/null
+++ b/changelog/fix_incorrect_documentation_urls.md
@@ -0,0 +1 @@
+* [#299](https://github.com/rubocop/rubocop-performance/pull/299): Fix incorrect documentation URLs when using `rubocop --show-docs-url`. ([@r7kamura][])
diff --git a/config/default.yml b/config/default.yml
index 0b5f4c5a5d..0d8a912452 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -1,5 +1,8 @@
 # This is the default configuration file.
 
+Performance:
+  DocumentationBaseURL: https://docs.rubocop.org/rubocop-performance
+
 Performance/AncestorsInclude:
   Description: 'Use `A <= B` instead of `A.ancestors.include?(B)`.'
   Reference: 'https://github.com/JuanitoFatas/fast-ruby#ancestorsinclude-vs--code'