diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ Adapted from Ernesto Martínez García's [definitely-not-isec-slides](https://ty
 
 ![thumbnail](thumbnail.png)
 
+The above screenshot uses the Fira Sans and Fira Math fonts.
+
 ## Installation (Linux only)
 
 #### Using `typship`