diff --git a/vector/proguard-rules.pro b/vector/proguard-rules.pro
index 56d3b95510..bc27767d8a 100644
--- a/vector/proguard-rules.pro
+++ b/vector/proguard-rules.pro
@@ -20,4 +20,7 @@
 # hide the original source file name.
 #-renamesourcefileattribute SourceFile
 
--keep class im.vector.riotx.features.** { *; }
\ No newline at end of file
+-keep class im.vector.riotx.features.** { *; }
+
+## print all the rules in a file
+# -printconfiguration ../proguard_files/full-r8-config.txt