diff --git a/assays/RNA_extraction/protocols/trizol_RNA_extraction.txt b/assays/RNA_extraction/protocols/trizol_RNA_extraction.md
similarity index 97%
rename from assays/RNA_extraction/protocols/trizol_RNA_extraction.txt
rename to assays/RNA_extraction/protocols/trizol_RNA_extraction.md
index 160b4a9ab47dce00c4a30b521ec66e050a2b9c52..8c3e718c31b0318a76e77cb0f777249120f08d6f 100644
--- a/assays/RNA_extraction/protocols/trizol_RNA_extraction.txt
+++ b/assays/RNA_extraction/protocols/trizol_RNA_extraction.md
@@ -1,4 +1,4 @@
-TRIzol RNA extraction
+## TRIzol RNA extraction
 
 -	Grind your samples 2 x 45sec at maximum frequency (30 Hertz) in TissueLyser (QIAGEN), use pre-cooled adapters
 -	Add 500 µL of TRIzol to the frozen samples, close tubes and mix vigorously until the sample is homogeneous