diff --git a/bip-0001.txt b/bip-0001.md
similarity index 100%
rename from bip-0001.txt
rename to bip-0001.md
diff --git a/bip-0011.txt b/bip-0011.md
similarity index 100%
rename from bip-0011.txt
rename to bip-0011.md
diff --git a/bip-0012.txt b/bip-0012.md
similarity index 100%
rename from bip-0012.txt
rename to bip-0012.md
diff --git a/bip-0013.txt b/bip-0013.md
similarity index 100%
rename from bip-0013.txt
rename to bip-0013.md