diff --git a/pages/las.inkscape.authoring.md b/pages/las.inkscape.authoring.md
index 6e562ba..9ce44bc 100644
--- a/pages/las.inkscape.authoring.md
+++ b/pages/las.inkscape.authoring.md
@@ -53,4 +53,8 @@ mouse pointer --> edge - edge scrolling [fullscreen must be on]
 
 
 ## image optimizations
+`parallel --lb --tag optipng -o 5 -i 1 ::: **/*.png`
 
+- `parallel` = process in [parallel](https://www.gnu.org/software/parallel/)
+- `-o 5` = ridiculously high optimization
+- `-i 1` = turn on [interlacing](https://blog.codinghorror.com/progressive-image-rendering/)