diff --git a/PolyCut.Core/Issues.md b/PolyCut.Core/Issues.md
index b03f7a6..288905f 100644
--- a/PolyCut.Core/Issues.md
+++ b/PolyCut.Core/Issues.md
@@ -46,7 +46,7 @@
 
 ## PolyCut.Core
 ### Parity Features
-- [ ] Extract single colour
+- [X] Extract single colour
 - [ ] Shading threshold
 - [ ] Shading density based on colour
 - [ ] Shading density based on brightness?
@@ -75,4 +75,4 @@
 ### Ambitious
 - [ ] Klipper Configuration Generator
 - [ ] Export over serial
-- [ ] Switch to Avalonia for Linux/Mac compatibility
\ No newline at end of file
+- [ ] Switch to Avalonia for Linux/Mac compatibility