diff --git a/README.rst b/README.rst
index 0878b3d3..bb30e2e4 100644
--- a/README.rst
+++ b/README.rst
@@ -11,7 +11,7 @@ PDFgui
 Graphical user interface program for structure refinements to atomic
 pair distribution function.
 
-PDFgui is a friendly interface to PDFfit2 refinement engine, with many
+PDFgui is a friendly interface to the PDFfit2 refinement engine, with many
 powerful extensions.  To get started, please open the manual from the
 help menu and follow the tutorial instructions.  A detailed description
 is available in the doc/Farrow-jpcm-2007.pdf paper.
diff --git a/requirements/run.txt b/requirements/run.txt
new file mode 100644
index 00000000..10e45f83
--- /dev/null
+++ b/requirements/run.txt
@@ -0,0 +1,5 @@
+numpy
+wxpython
+diffpy.pdffit2
+diffpy.utils
+matplotlib-base
diff --git a/requirements/test.txt b/requirements/test.txt
new file mode 100644
index 00000000..7167f602
--- /dev/null
+++ b/requirements/test.txt
@@ -0,0 +1,2 @@
+pytest
+freezegun