diff --git a/.gitignore b/.gitignore
index c3d8de1..c022ab5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -21,5 +21,11 @@ coverage.html
 # Tags
 tags
 
+# IntelliJ and friends
+.idea/
+
+# Makefile
+Makefile
+
 # Local TODO
 TODO.md
diff --git a/.golangci.yml b/.golangci.yml
index 0ff1242..d7aeec5 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -123,6 +123,24 @@ linters-settings:
         json: snake
         yaml: snake
 
+  goheader:
+    values:
+      regexp:
+        YEARS: '(20\d\d - 20\d\d|20\d\d, 20\d\d|20\d\d)'
+    template: |-
+      Copyright © {{ YEARS }} Attestant Limited.
+      Licensed under the Apache License, Version 2.0 (the "License");
+      you may not use this file except in compliance with the License.
+      You may obtain a copy of the License at
+
+          http://www.apache.org/licenses/LICENSE-2.0
+
+      Unless required by applicable law or agreed to in writing, software
+      distributed under the License is distributed on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+      See the License for the specific language governing permissions and
+      limitations under the License.
+
 linters:
   # Enable all available linters.
   # Default: false