Add comments to u32_from_BE in header file

src/utils.h

@@ -31,7 +31,8 @@ int local_strchr(char* string, char ch);
 // `itoa` for uint32_t.
 void u32_to_str(char* dest, uint8_t dest_size, uint32_t in);
 
-// Converts a list of bytes (in BE) of length `size` to a uint32_t.
+// Converts a list of bytes (in BE) of length `size` to a uint32_t. `strict` will make the function
+// throw if the size is > 4.
 uint32_t u32_from_BE(uint8_t* in, uint8_t size, bool strict);
 
 void amountToString(uint8_t* amount,