diff --git a/doc/evolution.md b/doc/evolution.md
index 0ccac0a..05e7a2a 100644
--- a/doc/evolution.md
+++ b/doc/evolution.md
@@ -832,10 +832,19 @@ Zero dead exported functions remain (verified via LSP + grep across all repos).
 
 ## Phase 19: EDSL Extraction & Structural Cleanup (Aug 3–4)
 
-The declarative EDSL that powered the 9P filesystem was extracted into a
-standalone, reusable library. Alongside this, accumulated cruft was removed:
-dead packages, obsolete scripts, and features that no longer justified their
-complexity.
+The declarative EDSL created in Phase 15 was extracted into a standalone,
+reusable library. This wasn't just moving code — the EDSL itself was
+**created from scratch on Aug 2** to replace ~3,100 lines of imperative
+filesystem code. Within 48 hours it went from concept to extracted library.
+
+The trajectory:
+1. **Aug 2 morning**: Created the EDSL (Phase 15) — replaced imperative tree-building with declarative spec
+2. **Aug 2 afternoon**: Streamlined the 9P server (Phase 16) — reduced to thin protocol handler
+3. **Aug 3**: Extracted EDSL to `fsedsl/` as a reusable library
+4. **Aug 4**: Structural cleanup — removed dead packages, improved `o` CLI
+
+This rapid iteration exemplifies the project's development style: build the
+right abstraction, validate it works, then extract it for reuse.
 
 ### fsedsl: Standalone Library