diff --git a/.gitignore b/.gitignore
index fb885e9..6f0f1d6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,7 @@
+# Copyright (c) 2012-2020 Jeremy Stanley <fungi@yuggoth.org>. Permission to
+# use, copy, modify, and distribute this software is granted under terms
+# provided in the LICENSE file distributed with this software.
+
 *_old
 *Gaz_*_national.zip
 COOP-ACT.TXT
diff --git a/overrides.conf b/overrides.conf
index f563ebe..12825d3 100644
--- a/overrides.conf
+++ b/overrides.conf
@@ -1,4 +1,4 @@
-# Copyright (c) 2006-2016 Jeremy Stanley <fungi@yuggoth.org>. Permission to
+# Copyright (c) 2006-2020 Jeremy Stanley <fungi@yuggoth.org>. Permission to
 # use, copy, modify, and distribute this software is granted under terms
 # provided in the LICENSE file distributed with this software.
 
diff --git a/overrides.log b/overrides.log
index 0e98bd9..69d3b61 100644
--- a/overrides.log
+++ b/overrides.log
@@ -1,3 +1,7 @@
+# Copyright (c) 2020 Jeremy Stanley <fungi@yuggoth.org>. Permission to
+# use, copy, modify, and distribute this software is granted under terms
+# provided in the LICENSE file distributed with this software.
+
 added zone hkz000 (+4 options)
 changed station cahr (+3 options)
 changed station cerm (+3 options)
diff --git a/qa.log b/qa.log
index 9454294..9ca6503 100644
--- a/qa.log
+++ b/qa.log
@@ -1,3 +1,7 @@
+# Copyright (c) 2020 Jeremy Stanley <fungi@yuggoth.org>. Permission to
+# use, copy, modify, and distribute this software is granted under terms
+# provided in the LICENSE file distributed with this software.
+
 cpxl: no description
 cpxl: no location
 ctnk: no description
diff --git a/weather.py b/weather.py
index ee25089..5b71fc0 100644
--- a/weather.py
+++ b/weather.py
@@ -1739,6 +1739,12 @@ def correlate():
     if os.path.exists(overrideslog_fn):
         os.rename(overrideslog_fn, "%s_old"%overrideslog_fn)
     overrideslog_fd = codecs.open(overrideslog_fn, "w", "utf8")
+    import time
+    overrideslog_fd.write(
+        '# Copyright (c) %s Jeremy Stanley <fungi@yuggoth.org>. Permission to\n'
+        '# use, copy, modify, and distribute this software is granted under terms\n'
+        '# provided in the LICENSE file distributed with this software.\n\n'
+        % time.gmtime().tm_year)
     overrideslog_fd.writelines(overrideslog)
     overrideslog_fd.close()
     print("done (%s overridden sections: +%s/-%s/!%s)." % (
@@ -2087,6 +2093,12 @@ def correlate():
     if os.path.exists(qalog_fn):
         os.rename(qalog_fn, "%s_old"%qalog_fn)
     qalog_fd = codecs.open(qalog_fn, "w", "utf8")
+    import time
+    qalog_fd.write(
+        '# Copyright (c) %s Jeremy Stanley <fungi@yuggoth.org>. Permission to\n'
+        '# use, copy, modify, and distribute this software is granted under terms\n'
+        '# provided in the LICENSE file distributed with this software.\n\n'
+        % time.gmtime().tm_year)
     qalog_fd.writelines(qalog)
     qalog_fd.close()
     if qalog: