diff --git a/lib/destinations/create b/lib/destinations/create
index 5c9910b..f9664d8 100644
--- a/lib/destinations/create
+++ b/lib/destinations/create
@@ -1,7 +1,22 @@
 #!/bin/bash
+
+# Copyright © 2012-2026 ScriptFanix
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# A copy of the GNU General Public License v3 is includded in the LICENSE file
+# at the root of the project.
+
 createDestinations() {
 	for destination in ${destinations[@]}
 	do
+		# Create destination directory if it doesn't exist yet
 		if ! [ -d "${destinationpath["$destination"]}" ]
 		then
 			if ! mkdir -p "${destinationpath["$destination"]}"
@@ -10,6 +25,8 @@ createDestinations() {
 				exit $EINVDEST
 			fi
 		fi
+		# Ensure the destination has a DB record; store its numeric ID
+		# for later use
 		destinationid["$destination"]=$(
 			InsertIfUnset destinations <<<"name $destination ${destinationenabled[\"$destination\"]}"
 		)
diff --git a/lib/destinations/updateMimes b/lib/destinations/updateMimes
index 6835e01..312241b 100644
--- a/lib/destinations/updateMimes
+++ b/lib/destinations/updateMimes
@@ -1,12 +1,32 @@
 #!/bin/bash
+
+# Copyright © 2012-2026 ScriptFanix
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# A copy of the GNU General Public License v3 is includded in the LICENSE file
+# at the root of the project.
+
 updateMimes() {
+	# Reset all mime_actions to action=1 (transcode) as the default
 	Update mime_actions action 1 <<<"action != 1"
+
+	# For each destination's skip patterns, set action=0 (exclude from
+	# processing)
+	# Multiple patterns are pipe-separated; split by setting IFS='|'
 	for destination in ${!destinationskipmime[@]}
 	do
 		IFS='|'
 		for mime_type in ${destinationskipmime["$destination"]}
 		do
 			IFS="$oldIFS"
+			# Convert config wildcard '*' to SQL wildcard '%'
 			Update mime_type_actions action 0 >/dev/null < <(
 				cat <<-EOWhere
 					destination_id = ${destinationid["$destination"]}
@@ -15,12 +35,17 @@ updateMimes() {
 			)
 		done
 	done
+
+	# For each destination's copy-mime patterns, set action=2 (copy
+	# verbatim)
+	# Multiple patterns are pipe-separated; split by setting IFS='|'
 	for destination in ${!destinationcopymime[@]}
 	do
 		IFS='|'
 		for mime_type in ${destinationcopymime["$destination"]}
 		do
 			IFS="$oldIFS"
+			# Convert config wildcard '*' to SQL wildcard '%'
 			Update mime_type_actions action 2 >/dev/null < <(
 				cat <<-EOWhere
 					destination_id = ${destinationid["$destination"]}