diff --git a/README.txt b/README.txt
index 1629f30..0ea4bb1 100644
--- a/README.txt
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@@ -43,3 +43,5 @@ STEP2-STEP6 can mutually transition among each other maintaining all changes mad
 
 Please see the following paper for example usages of PyMUS ver 2.0:
 Kim H and Kim M (2018) PyMUS: Python-Based Simulation Software for Virtual Experiments on Motor Unit System. Front. Neuroinform. 12:15. doi: 10.3389/fninf.2018.00015
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+Practice with pull requests