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diff --git a/src/storage/phrase_large_table3_tkrzwdb.h b/src/storage/phrase_large_table3_tkrzwdb.h
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+/* 
+ *  libpinyin
+ *  Library to deal with pinyin.
+ *  
+ *  Copyright (C) 2025 Peng Wu <alexepico@gmail.com>
+ *  
+ *  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, or
+ *  (at your option) any later version.
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef PHRASE_LARGE_TABLE3_TKRZWDB_H
+#define PHRASE_LARGE_TABLE3_TKRZWDB_H
+
+#include "novel_types.h"
+#include "memory_chunk.h"
+#include <tkrzw_dbm.h>
+
+namespace pinyin{
+
+class PhraseTableEntry;
+
+class PhraseLargeTable3{
+private:
+    /* member variables. */
+    tkrzw::DBM * m_db;
+
+protected:
+    PhraseTableEntry * m_entry;
+
+    void reset();
+
+public:
+    PhraseLargeTable3();
+
+    ~PhraseLargeTable3(){
+        reset();
+    }
+
+    /* attach method */
+    bool attach(const char * dbfile, guint32 flags);
+
+    /* load_db/store_db method */
+    /* use in-memory DBM here, for better performance. */
+    bool load_db(const char * filename);
+
+    bool store_db(const char * new_filename);
+
+    bool load_text(FILE * infile);
+
+    /* search method */
+    int search(int phrase_length, /* in */ const ucs4_t phrase[],
+               /* out */ PhraseTokens tokens) const;
+    int search_suggestion(int phrase_length, /* in */ const ucs4_t phrase[],
+                          /* out */ PhraseTokens tokens) const;
+
+    /* add_index/remove_index method */
+    int add_index(int phrase_length, /* in */ const ucs4_t phrase[], /* in */ phrase_token_t token);
+
+    int remove_index(int phrase_length, /* in */ const ucs4_t phrase[], /* in */ phrase_token_t token);
+
+    /* mask out method */
+    bool mask_out(phrase_token_t mask, phrase_token_t value);
+};
+
+};
+
+#endif