diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c6e40c0746..1d145c0d3f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@
 
 ### Changes
 
+* [#7465](https://github.com/rubocop-hq/rubocop/pull/7465): Add `os` to allowed names of `Naming/UncommunicativeMethodParamName` cop in default config. ([@nijikon][])
 * [#7446](https://github.com/rubocop-hq/rubocop/issues/7446): Add `merge` to list of non-mutating methods. ([@cstyles][])
 * [#7077](https://github.com/rubocop-hq/rubocop/issues/7077): Rename `Unneeded*` cops to `Redundant*` (e.g., `Style/UnneededPercentQ` becomes `Style/RedundantPercentQ`). ([@scottmatthewman][])
 
diff --git a/config/default.yml b/config/default.yml
index 486a9a863eb..85dcaf50773 100644
--- a/config/default.yml
+++ b/config/default.yml
@@ -2075,6 +2075,7 @@ Naming/UncommunicativeMethodParamName:
     - at
     - ip
     - db
+    - os
   # Blacklisted names that will register an offense
   ForbiddenNames: []
 
diff --git a/manual/cops_naming.md b/manual/cops_naming.md
index 80be9b7648d..a48227f844b 100644
--- a/manual/cops_naming.md
+++ b/manual/cops_naming.md
@@ -663,7 +663,7 @@ Name | Default value | Configurable values
 --- | --- | ---
 MinNameLength | `3` | Integer
 AllowNamesEndingInNumbers | `true` | Boolean
-AllowedNames | `io`, `id`, `to`, `by`, `on`, `in`, `at`, `ip`, `db` | Array
+AllowedNames | `io`, `id`, `to`, `by`, `on`, `in`, `at`, `ip`, `db`, `os` | Array
 ForbiddenNames | `[]` | Array
 
 ## Naming/VariableName