diff --git a/modules/bindings/pymod/kclust.py b/modules/bindings/pymod/kclust.py
index 944c73701f248688bf02afb3be9fa87146aae0be..3a0605be3765eea274dc97c799a34aabc0ff191a 100644
--- a/modules/bindings/pymod/kclust.py
+++ b/modules/bindings/pymod/kclust.py
@@ -11,6 +11,11 @@ HHblits: lighting-fast iterative protein sequence searching by
 HMM-HMM alignment
 Nature Methods 9, 173-175 (2012)
 
+source code can be downloaded from:
+
+ftp://toolkit.genzentrum.lmu.de/pub/
+
+
 """
 
 class cluster: