diff --git a/doc/firefox-tuning.txt b/doc/firefox-tuning.md
similarity index 100%
rename from doc/firefox-tuning.txt
rename to doc/firefox-tuning.md
diff --git a/doc/from-debian-stable-to-testing-etc.txt b/doc/from-debian-stable-to-testing-etc.md
similarity index 100%
rename from doc/from-debian-stable-to-testing-etc.txt
rename to doc/from-debian-stable-to-testing-etc.md
diff --git a/doc/installing-kernel-headers.txt b/doc/installing-kernel-headers.md
similarity index 100%
rename from doc/installing-kernel-headers.txt
rename to doc/installing-kernel-headers.md