diff --git a/README.md b/README.md
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+++ b/README.md
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+These are the source codes used in
+
+Cressman JR, Ullah G, Ziburkus J, Schiff SJ, Barreto E (2009) The influence of sodium and potassium dynamics on excitability, seizures, and the stability of persistent states: I. Single neuron dynamics. *J Comput Neurosci* 26:159-70
+
+The code for the full model is written in C and uses routines from Numerical Recipes in C.
+
+The code for the reduced model runs on XPP.
+
+---
+
+2025-06-20: Converted README to Markdown.
diff --git a/README.txt b/README.txt
deleted file mode 100644
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--- a/README.txt
+++ /dev/null
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-These are the source codes used in
-
-Cressman JR, Ullah G, Ziburkus J, Schiff SJ, Barreto E (2009) The
-influence of sodium and potassium dynamics on excitability, seizures,
-and the stability of persistent states: I. Single neuron dynamics. J
-Comput Neurosci 26:159-70
-
-The code for the full model is written in C and uses routines from
-Numerical Recipes in C.
-
-The code for the reduced model runs on XPP.