diff --git a/Performance.md b/Performance.md
index 9b4cdb9..7dbc0d3 100644
--- a/Performance.md
+++ b/Performance.md
@@ -24,6 +24,7 @@
 - controlled binary size
 - `O3` level compiler optimization
 - 0-warning statically-analyzed code (forced `-Wall -Wextra -Werror` in CI)
+- statically generated hash-table for guaranteed `O(1)` extension icon lookups.
 
 #### Rejected options