diff --git a/README.md b/README.md
index 7edd748..bc8cb5e 100644
--- a/README.md
+++ b/README.md
@@ -11,12 +11,12 @@ knit("PartIIphyloseq.Rnw")
 
 The three Rnw files can be executed independently. 
 
-PartIdada.rnw is the read/bioinformatics preprocessing and is fairly time-consuming, 
+`PartIdada.rnw` is the read/bioinformatics preprocessing and is fairly time-consuming, 
 (it can take 3-6 hours on modern laptops).
 
-PartIIphyloseq.rnw performs a few analyses with phyloseq and is quite fast.
+`PartIIphyloseq.rnw` performs a few analyses with phyloseq and is quite fast.
 
-PartIIIanalysis.rnw performs all the statistical analyses and the machine learning components can take about 10
+`PartIIIanalysis.rnw` performs all the statistical analyses and the machine learning components can take about 10
 minutes.