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diff --git a/README b/README
index 91dd532..e9f67ba 100644
--- a/README
+++ b/README
@@ -61,3 +61,8 @@ References
     A little bit to complicated for my taste, I prefer direct asynchronous
     I/O without an abstraction library like libevent. Also I prefer to
     use libssh unpatched.
+
+[7] https://github.com/doches/progressbar
+    For the SCP mode showing what cscp is doing is really nice, a progress
+    bar library like this one is handy, must support multiple progress
+    bars on multiple lines in parallel.