diff --git a/sources b/sources
index d295cb5..812e3b3 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,4 @@
 a0ef96a9f8787477f280f62e24bad928  InsightToolkit-4.8.1.tar.xz
 d9ca6d651bd47a668afd8db8d93ae49e  InsightData-4.8.1.tar.xz
+18743320383589f650ced41452a55ae8  InsightSoftwareGuide-Book1-4.8.0.pdf
+8d5c956d924ebecd9a2ffdc80acb3e9b  InsightSoftwareGuide-Book2-4.8.0.pdf