diff --git a/shematic.svg b/shematic.svg
index acc4472..acc0ebe 100644
--- a/shematic.svg
+++ b/shematic.svg
@@ -351,9 +351,9 @@
   <rect x="320" y="88" width="260" height="120" rx="5" fill="#0d1820" stroke="#2a4a5e" stroke-width="1"/>
   <text x="450" y="108" text-anchor="middle" fill="#7a9ab0" font-size="10" letter-spacing="2">LEGEND</text>
   <line x1="335" y1="125" x2="375" y2="125" stroke="#ffcc66" stroke-width="2"/>
-  <text x="385" y="129" fill="#cccccc" font-size="10">Heater Zone (+)</text>
+  <text x="385" y="129" fill="#cccccc" font-size="10">Heater Zone (L)</text>
   <line x1="335" y1="143" x2="375" y2="143" stroke="#ffcc66" stroke-width="2" opacity="0.4"/>
-  <text x="385" y="147" fill="#cccccc" font-size="10">Heater Zone (−)</text>
+  <text x="385" y="147" fill="#cccccc" font-size="10">Heater Zone (N)</text>
   <line x1="335" y1="161" x2="375" y2="161" stroke="#44ffcc" stroke-width="2"/>
   <text x="385" y="165" fill="#cccccc" font-size="10">TC J-type (+)</text>
   <line x1="335" y1="179" x2="375" y2="179" stroke="#44ffcc" stroke-width="2" opacity="0.35"/>