diff --git a/requirements.txt b/requirements.txt
index 2df4b22c..5948f382 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,3 +10,5 @@
 # pygraphviz >= 1.3.1 (drawing dependencies diagram)
 # perl 5 language and graph-easy >= 0.75 (drawing dependencies ascii diagram)
 # python2-pythondialog >= 3.3.0 (Python interface to the UNIX dialog utility)
+# python3-pythondialog >= 3.3.0 (Python interface to the UNIX dialog utility)
+# python3 (for support Python 3.x)