diff --git a/Feature-coverage-per-architecture.md b/Feature-coverage-per-architecture.md
index 8a59720..e548ee4 100644
--- a/Feature-coverage-per-architecture.md
+++ b/Feature-coverage-per-architecture.md
@@ -3,11 +3,11 @@ The following table shows which features are implemented for which CPU architect
 feature | 6502 | 65816 | Z80 | 8080 | LR35902
 --|--|--|--|--|--
 `*`, `*=`                 | ✔️ | ✔️ | ✔️ | ✔️ | ✔️
-signed comparisons        | ✔️ | ✔️ | ✔️ | ⚠️<sup>1</sup> | ⚠️<sup>1</sup>
+signed comparisons        | ✔️ | ✔️ | ✔️ | ✔️ | ✔️
 stack variables           | ✔️ | ✔️ | ✔️ | 🐌 | 🐌
 assembly                  | ✳️<sup>2</sup> | 🚧<sup>3</sup> | ✔️ | ✔️ | 🚧<sup>4</sup>
 other features            | ✔️ | 🐌 | ✔️ | ✔️ | ✔️
-optimization              | ✔️ | 🚧<sup>5</sup> | ✔️ | 🚧 | 🚧
+optimization              | ✔️ | 🚧<sup>5</sup> | ✔️ | 🚧<sup>6</sup> | 🚧<sup>6</sup>
 assembly syntax colouring | ✔️ | 🚧<sup>5</sup> | ❌ | ❌ | ❌
 
 ##### Legend:
@@ -32,6 +32,7 @@ assembly syntax colouring | ✔️ | 🚧<sup>5</sup> | ❌ | ❌ | ❌
 
 5. Optimized for the processor in the emulation mode used as an accelerator for a 6502-based system. Doesn't utilize its full capabilities in the native mode.
 
+6. Major missing optimization is elision of stack variables.
 
 #### Further remarks