diff --git a/master.tex b/master.tex
index eec93a8fd8d2464c02f5b916b230dc940a01d97e..8e6d589a5dcd1e28bbca142ec7cb00ae5b5b8dd4 100644
--- a/master.tex
+++ b/master.tex
@@ -144,9 +144,12 @@
     \url{https://gitlab.cs.fau.de/oj14ozun/algprog-summary}, or ought
     also be accessible as a PDF attachment:
     \attachfile[icon=Paperclip,zoom=false,description=A Git bundle of
-    the document sources.]{algprog.pack}, see \texttt{git-bundle(1)}.
-    The document and the source are published under the terms and
-    conditions of
+    the document sources.  If your PDF viewer does not support
+    extracting PDF attachments use a tool like pdfdetach.  You can check
+    repository out by executing git clone algprog.pack.  Use
+    git-send-email(1) to submit patches.]{algprog.pack}, see
+    \texttt{git-bundle(1)}.  The document and the source are published
+    under the terms and conditions of
     \href{https://creativecommons.org/licenses/by-sa/4.0/}{CC BY-SA
       4.0}.}, last typeset on \today.
 }