From 9c09cfdc90c8a80e43f2affb93c7cb13fced5d47 Mon Sep 17 00:00:00 2001
From: Daniel Hutzschenreuter <daniel.hutzschenreuter@ptb.de>
Date: Mon, 17 Jun 2024 07:45:25 +0000
Subject: [PATCH] Update UnitSystem.md

---
 wiki/doc/UnitSystem.md | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/wiki/doc/UnitSystem.md b/wiki/doc/UnitSystem.md
index 3eeab3c..d6c3c8a 100644
--- a/wiki/doc/UnitSystem.md
+++ b/wiki/doc/UnitSystem.md
@@ -4,18 +4,19 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 |D-SI Identifyer|D-SI Medal|SI name|SI symbol |SI Reference| 
 |-:|-:|-:|-:|-:| 
 |\metre|platinum|meter|m|[1, Table 2]| 
-|\kilogram<sup>a</sup>|platinum|kilogram|kg|[1, Table 2]| 
+|\kilogram<sup>(a</sup>|platinum|kilogram|kg|[1, Table 2]| 
 |\second|platinum|second|s|[1, Table 2]| 
 |\ampere|platinum|ampere|A|[1, Table 2]| 
 |\kelvin|platinum|kelvin|K|[1, Table 2]| 
 |\mole|platinum|mole|mol|[1, Table 2]| 
 |\candela|platinum|candela|cd|[1, Table 2]|"
 
+<sub>(a: It is not allowed to use unit kilogram with a prefix. </sub>
 
 ## D-SI additional platinum units of measurement 
 |D-SI Identifyer|D-SI Medal|SI name|SI symbol |SI Reference| 
 |-:|-:|-:|-:|-:| 
-|\one|platinum|one|1|[1, Sec. 2.2.1]| 
+|\one<sup>(b</sup>|platinum|one|1|[1, Sec. 2.2.1]| 
 |\day|platinum|day|d|[1, Table 8]| 
 |\hour|platinum|hour|h|[1, Table 8]| 
 |\minute|platinum|minute|min|[1, Table 8]| 
@@ -23,6 +24,7 @@ Description how to build units witht the D-SI format is [here](StructureSIUnits.
 |\arcminute|platinum|arcminute|‘|[1, Table 8]| 
 |\arcsecond|platinum|arcsecond|“|[1, Table 8]|"
 
+<sub>(a: It is not allowed to use unit kilogram with a prefix. </sub>
 
 ## SI derived units of measurement 
 |D-SI Identifyer|D-SI Medal|SI name|SI symbol |SI base unit expression|D-SI base unit expression|SI Reference| 
-- 
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