diff --git a/lib/Ebook.php b/lib/Ebook.php
index 888e4b5e..35d6e9fc 100644
--- a/lib/Ebook.php
+++ b/lib/Ebook.php
@@ -1951,7 +1951,7 @@ class Ebook{
 						inner join EbookTags et using (EbookId)
 						where et.TagId = ?
 						    and et.EbookId != ?
-						order by RAND()
+						order by rand()
 						limit ?
 				', [$relatedTag->TagId, $ebook->EbookId, $count], Ebook::class);
 		}
@@ -1960,7 +1960,7 @@ class Ebook{
 						SELECT *
 						from Ebooks
 						where EbookId != ?
-						order by RAND()
+						order by rand()
 						limit ?
 				', [$ebook->EbookId, $count], Ebook::class);
 		}
diff --git a/lib/Enums/ArtworkFilterType.php b/lib/Enums/ArtworkFilterType.php
index 0293eaee..ee1231ae 100644
--- a/lib/Enums/ArtworkFilterType.php
+++ b/lib/Enums/ArtworkFilterType.php
@@ -2,13 +2,30 @@
 namespace Enums;
 
 enum ArtworkFilterType: string{
-	case Admin = 'admin'; // Show all artwork, regardless of status.
-	case All = 'all'; // Show all artwork, but only approved artwork if the logged-in user is not an admin.
-	case Approved = 'approved'; // Show all approved artwork.
-	case ApprovedInUse = 'approved_in_use'; // Show all approved that is in-use.
-	case ApprovedNotInUse = 'approved_not_in_use'; // Show all approved that is not in-use.
-	case ApprovedSubmitter = 'approved_submitter'; // Show all approved artwork, plus unverified artwork which the logged-in user has submitted.
-	case Declined = 'declined'; // Show only declined artwork.
-	case Unverified = 'unverified'; // Show only unverified artwork.
-	case UnverifiedSubmitter = 'unverified_submitter'; // Show only unverified artwork that the logged-in user has submitted.
+	/** Show all artwork, regardless of status. */
+	case Admin = 'admin';
+
+	/** Show all artwork, but only approved artwork if the logged-in user is not an admin. */
+	case All = 'all';
+
+	/** Show all approved artwork. */
+	case Approved = 'approved';
+
+	/** Show all approved that is in-use. */
+	case ApprovedInUse = 'approved_in_use';
+
+	/** Show all approved that is not in-use. */
+	case ApprovedNotInUse = 'approved_not_in_use';
+
+	/** Show all approved artwork, plus unverified artwork which the logged-in user has submitted. */
+	case ApprovedSubmitter = 'approved_submitter';
+
+	/** Show only declined artwork. */
+	case Declined = 'declined';
+
+	/** Show only unverified artwork. */
+	case Unverified = 'unverified';
+
+	/** Show only unverified artwork that the logged-in user has submitted. */
+	case UnverifiedSubmitter = 'unverified_submitter';
 }
diff --git a/lib/Enums/DateTimeFormat.php b/lib/Enums/DateTimeFormat.php
index 5312e3e2..000fb314 100644
--- a/lib/Enums/DateTimeFormat.php
+++ b/lib/Enums/DateTimeFormat.php
@@ -2,11 +2,24 @@
 namespace Enums;
 
 enum DateTimeFormat: string{
-	case Sql = 'Y-m-d H:i:s'; // `2022-01-05 23:42:12`
-	case Iso = 'Y-m-d\TH:i:s\Z'; // `2022-01-05T23:42:12Z`
-	case FullDateTime = 'F j, Y g:i a'; // `January 5, 2022 2:04 pm`
-	case Ical = 'Ymd\THis\Z'; //20220105T234212Z
-	case Html = 'Y-m-d\TH:i:s';  // `2022-01-05T23:42:12`
-	case Rss = 'r'; // `D, d M Y H:i:s`
+	/** Like `2022-01-05 23:42:12`. */
+	case Sql = 'Y-m-d H:i:s';
+
+	/** Like `2022-01-05T23:42:12Z`. */
+	case Iso = 'Y-m-d\TH:i:s\Z';
+
+	/** Like `January 5, 2022 2:04 pm`. */
+	case FullDateTime = 'F j, Y g:i a';
+
+	/** Like `20220105T234212Z`. */
+	case Ical = 'Ymd\THis\Z';
+
+	/** Like `2022-01-05T23:42:12`. */
+	case Html = 'Y-m-d\TH:i:s';
+
+	/** Like `Sat, 5 Jan 2022 23:42:12 +0000`. */
+	case Rss = 'r';
+
+	/** Like `1641426132`. */
 	case UnixTimestamp = 'U';
 }
diff --git a/lib/Enums/HttpCode.php b/lib/Enums/HttpCode.php
index afa489fe..20d58acd 100644
--- a/lib/Enums/HttpCode.php
+++ b/lib/Enums/HttpCode.php
@@ -7,8 +7,12 @@ enum HttpCode: int{
 	case Accepted = 202;
 	case NoContent = 204;
 
-	case MovedPermanently = 301; // Permanent redirect
-	case Found = 302; // Temporary redirect
+	/** Permanent redirect. */
+	case MovedPermanently = 301;
+
+	/** Temporary redirect. */
+	case Found = 302;
+
 	case SeeOther = 303;
 
 	case BadRequest = 400;