diff --git a/Chapters/4-Interpreter/figures/README.md b/Chapters/4-Interpreter/figures/README.md
index c5186a4..c1d4686 100644
--- a/Chapters/4-Interpreter/figures/README.md
+++ b/Chapters/4-Interpreter/figures/README.md
@@ -16,6 +16,11 @@ Converting ascii art to pdf requires two command line tools: `aasvg` and `rsvg-c
 npm install -g aasvg
 sudo apt-get install librsvg2-bin
 ```
+If the previous apt-get does not work
+
+```
+ brew install librsvg
+```
 
 Figure source code is asciiart and named `*-ascii.txt`.
 We then convert them to svg using the following commands.