diff --git a/src/database.h b/src/database.h
index b7325d4..0ec1aad 100644
--- a/src/database.h
+++ b/src/database.h
@@ -12,12 +12,6 @@ typedef struct {
   unsigned char caps[8];
 } imdb_t;
 
-typedef struct {
-  uint64_t start;
-  size_t records;
-  unsigned char *data;
-} imdb_block_t;
-
 /**
   Database header format - fixed length, 48 bytes
 
@@ -58,19 +52,28 @@ sect  |  [     0-15     ][    16-31     ][    32-48     ]
 #define REC_OFF_IH  6 /* image height */
 #define REC_OFF_BM 16 /* image bitmap */
 
+typedef struct {
+  uint64_t start;
+  size_t records;
+  unsigned char *data;
+} imdb_block_t;
+
 typedef struct {
   uint64_t num;
   unsigned char data[IMDB_REC_LEN];
 } imdb_rec_t;
 
+typedef struct {
+  uint64_t limit;
+  float tresh_bitmap;
+  float tresh_ratio;
+} imdb_search_t;
+
 typedef struct {
   uint64_t num;
   float diff;
 } imdb_match_t;
 
-extern int imdb_open (imdb_t *db, const char *path);
-extern int imdb_close(imdb_t *db);
-
 extern int imdb_read_rec (imdb_t *db, imdb_rec_t *rec);
 extern int imdb_write_rec(imdb_t *db, imdb_rec_t *rec);
 
@@ -80,6 +83,9 @@ extern int imdb_write_blk(imdb_t *db, imdb_block_t *blk);
 extern int imdb_read_list (imdb_t *db, imdb_rec_t *list, size_t list_len);
 extern int imdb_write_list(imdb_t *db, imdb_rec_t *list, size_t list_len);
 
+extern int imdb_open (imdb_t *db, const char *path);
+extern int imdb_close(imdb_t *db);
+
 /**
  @returns:
   -1 on error