diff --git a/src/library/entry.cr b/src/library/entry.cr
index 94e13fb..7399b0d 100644
--- a/src/library/entry.cr
+++ b/src/library/entry.cr
@@ -228,7 +228,7 @@ abstract class Entry
 
   abstract def page_dimensions
 
-  abstract def exists? : Bool?
+  abstract def examine : Bool?
 end
 
 class ZippedEntry < Entry
@@ -337,7 +337,7 @@ class ZippedEntry < Entry
     sizes
   end
 
-  def exists? : Bool
+  def examine : Bool
     File.exists? @zip_path
   end
 end
@@ -439,7 +439,7 @@ class DirectoryEntry < Entry
     sizes
   end
 
-  def exists? : Bool
+  def examine : Bool
     existence = File.exists? @dir_path
     return false unless existence
     files = DirectoryEntry.get_valid_files @dir_path
@@ -447,9 +447,8 @@ class DirectoryEntry < Entry
     existence = files.size > 0 && @signature == signature
     @sorted_files = nil unless existence
 
-    # For more efficient,
-    # Fix a directory instance with new property
-    # and return true
+    # For more efficient, update a directory entry with new property
+    # and return true like Title.examine
     existence
   end
 
diff --git a/src/library/title.cr b/src/library/title.cr
index ad1672d..f3b4866 100644
--- a/src/library/title.cr
+++ b/src/library/title.cr
@@ -132,7 +132,7 @@ class Title
 
     previous_entries_size = @entries.size
     @entries.select! do |entry|
-      existence = entry.exists?
+      existence = entry.examine
       Fiber.yield
       context["deleted_entry_ids"] << entry.id unless existence
       existence