diff --git a/const.hpp b/const.hpp
index fc93468..c2ff5b3 100644
--- a/const.hpp
+++ b/const.hpp
@@ -43,6 +43,9 @@
 constexpr uint8_t KW_VAL_PAIR_START_TAG = 0x84;
 constexpr uint8_t RECORD_END_TAG = 0x78;
 constexpr int UNEXP_LOCATION_CODE_MIN_LENGTH = 4;
+constexpr uint8_t EXP_LOCATIN_CODE_MIN_LENGTH = 17;
+static constexpr auto SE_KWD_LENGTH = 7;
+static constexpr auto INVALID_NODE_NUMBER = -1;
 
 namespace lengths
 {