diff --git a/manual/src/introduction.md b/manual/src/introduction.md
index 5de7e1229..34712dff9 100644
--- a/manual/src/introduction.md
+++ b/manual/src/introduction.md
@@ -1,7 +1,7 @@
 # Introduction
 
-Difftastic is a diff tool that understands syntax. It currently
-supports 18 languages:
+Difftastic ([source](https://github.com/wilfred/difftastic)) is a diff
+tool that understands syntax. It currently supports 18 languages:
 
 * C
 * C++