diff --git a/include/ucore/string.h b/include/ucore/string.h
index 3fb3b1c..eb5e3ee 100644
--- a/include/ucore/string.h
+++ b/include/ucore/string.h
@@ -29,7 +29,7 @@ char* uc_hex_encode(const uint8_t *in, size_t len, char *out);
  * @param maxlen max length of @in to convert,
  *        conversion stops when either maxlen is reached,
  *        nul terminator of in is found or a non hex digit is found.
- * @param out where to store result. Must hold at least maxlen/2
+ * @param out where to store result. Must hold at least maxlen/2 + 1
  * @return returns one past the end of the converted data
  */
 uint8_t* uc_hex_decode(const char *in, size_t maxlen,uint8_t *out);