diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/database/mappers/MangaTypeMapping.kt b/app/src/main/java/eu/kanade/tachiyomi/data/database/mappers/MangaTypeMapping.kt
index 266b57f1e5..fdfbab61f7 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/database/mappers/MangaTypeMapping.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/database/mappers/MangaTypeMapping.kt
@@ -11,10 +11,10 @@ import com.pushtorefresh.storio.sqlite.queries.InsertQuery
 import com.pushtorefresh.storio.sqlite.queries.UpdateQuery
 import eu.kanade.tachiyomi.data.database.models.Manga
 import eu.kanade.tachiyomi.data.database.models.MangaImpl
-import eu.kanade.tachiyomi.data.database.tables.MangaTable
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_ARTIST
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_AUTHOR
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_CHAPTER_FLAGS
+import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_DATE_ADDED
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_DESCRIPTION
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_FAVORITE
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_GENRE
@@ -63,7 +63,7 @@ class MangaPutResolver : DefaultPutResolver<Manga>() {
         put(COL_INITIALIZED, obj.initialized)
         put(COL_VIEWER, obj.viewer)
         put(COL_CHAPTER_FLAGS, obj.chapter_flags)
-        put(MangaTable.COL_DATE_ADDED, obj.date_added)
+        put(COL_DATE_ADDED, obj.date_added)
     }
 }
 
@@ -84,7 +84,7 @@ interface BaseMangaGetResolver {
         initialized = cursor.getInt(cursor.getColumnIndex(COL_INITIALIZED)) == 1
         viewer = cursor.getInt(cursor.getColumnIndex(COL_VIEWER))
         chapter_flags = cursor.getInt(cursor.getColumnIndex(COL_CHAPTER_FLAGS))
-        date_added = cursor.getLong(cursor.getColumnIndex(MangaTable.COL_DATE_ADDED))
+        date_added = cursor.getLong(cursor.getColumnIndex(COL_DATE_ADDED))
     }
 }
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/database/models/Manga.kt b/app/src/main/java/eu/kanade/tachiyomi/data/database/models/Manga.kt
index 811d035cdb..877f35c2f3 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/database/models/Manga.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/database/models/Manga.kt
@@ -43,10 +43,11 @@ interface Manga : SManga {
         else sortDescending()
     }
 
-    fun showChapterTitle(defaultShow: Boolean): Boolean {
-        return chapter_flags and DISPLAY_MASK == DISPLAY_NUMBER
-    }
+    fun showChapterTitle(defaultShow: Boolean): Boolean = chapter_flags and DISPLAY_MASK == DISPLAY_NUMBER
 
+    /**
+     * The type of comic the manga is (ie. manga, manhwa, manhua)
+     */
     fun mangaType(): Int {
         val sourceName = Injekt.get<SourceManager>().getOrStub(source).name
         val currentTags = genre?.split(",")?.map { it.trim().toLowerCase(Locale.US) }
@@ -79,6 +80,10 @@ interface Manga : SManga {
         else TYPE_MANGA
     }
 
+    /**
+     * The type the reader should use. Different from manga type as certain manga has different
+     * read types
+     */
     fun defaultReaderType(): Int {
         val sourceName = Injekt.get<SourceManager>().getOrStub(source).name
         val currentTags = genre?.split(",")?.map { it.trim().toLowerCase(Locale.US) }
@@ -145,10 +150,6 @@ interface Manga : SManga {
         const val SORT_LOCAL = 0x00001000
         const val SORT_SELF_MASK = 0x00001000
 
-        /*const val HIDE_GLOBAL = 0x00000000
-        const val HIDE_LOCAL = 0x00010000
-        const val HIDE_SELF_MASK = 0x00010000*/
-
         // Generic filter that does not filter anything
         const val SHOW_ALL = 0x00000000
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/database/queries/RawQueries.kt b/app/src/main/java/eu/kanade/tachiyomi/data/database/queries/RawQueries.kt
index 14a6a6effd..8b771323e1 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/database/queries/RawQueries.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/database/queries/RawQueries.kt
@@ -64,7 +64,7 @@ fun getRecentsQuery() = """
 """
 
 /**
- * Query to get the recent chapters of manga from the library up to a date.
+ * Query to get the recently added manga
  */
 fun getRecentAdditionsQuery(search: String) = """
     SELECT ${Manga.TABLE}.${Manga.COL_URL} as mangaUrl, * FROM ${Manga.TABLE}
@@ -76,7 +76,7 @@ fun getRecentAdditionsQuery(search: String) = """
 """
 
 /**
- * Query to get the recent chapters of manga from the library up to a date.
+ * Query to get the manga with recently uploaded chapters
  */
 fun getRecentsQueryDistinct(search: String) = """
     SELECT ${Manga.TABLE}.${Manga.COL_URL} as mangaUrl, ${Manga.TABLE}.*, ${Chapter.TABLE}.*
@@ -153,7 +153,8 @@ fun getRecentMangasLimitQuery(limit: Int = 25, search: String = "") = """
 """
 
 /**
- * Query to get the recently read chapters of manga from the library up to a date.
+ * Query to get the recently read manga that has more chapters to read
+ * The first from checks that there's an unread chapter
  * The max_last_read table contains the most recent chapters grouped by manga
  * The select statement returns all information of chapters that have the same id as the chapter in max_last_read
  * and are read after the given time period