diff -r b381da3a9b19 -r 54df904472b0 src/cx/json.h
--- a/src/cx/json.h	Thu Jan 09 21:19:52 2025 +0100
+++ b/src/cx/json.h	Thu Jan 09 22:37:10 2025 +0100
@@ -449,6 +449,8 @@
     bool sort_members;
     /**
      * The maximum number of fractional digits in a number value.
+     * The default value is 6 and values larger than 15 are reduced to 15.
+     * Note, that the actual number of digits may be lower, depending on the concrete number.
      */
     uint8_t frac_max_digits;
     /**