diff --git a/include/basen/hex.hpp b/include/basen/hex.hpp
index ce4bc26..5280dce 100644
--- a/include/basen/hex.hpp
+++ b/include/basen/hex.hpp
@@ -13,12 +13,23 @@ namespace hex
     bool isValid(const char *str, uint64_t str_size) noexcept;
     bool isValid(std::string_view str) noexcept;
 
+    /**
+     * @throw std::overflow_error if if there is an overflow
+     */
     uint64_t sizeEncoded(std::span<const uint8_t> data);
     uint64_t sizeDecoded(std::string_view str) noexcept;
 
+    /**
+     * @throw std::length_error if not enough allocated length
+     */
     void encode(const uint8_t *data, uint64_t data_size, char *str, uint64_t str_size);
     std::string encode(std::span<const uint8_t> data) noexcept;
 
+     /**
+     * @throw std::length_error if not enough allocated length
+     * @throw std::logic_error if out of digits map
+     * @throw std::logic_error if str_size %2 != 0 (isn't hex)
+     */
     void decode(const char *str, uint64_t str_size, uint8_t *data, uint64_t data_size);
     std::vector<uint8_t> decode(std::string_view str) noexcept;
 }
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