diff --git a/devtools/blockreplace.py b/devtools/blockreplace.py
index 72d92bcd0..fe4d7a5de 100644
--- a/devtools/blockreplace.py
+++ b/devtools/blockreplace.py
@@ -17,6 +17,7 @@ class Language(str, Enum):
     md = 'md'
     rst = 'rst'
     c = 'c'
+    yml = 'yml'
 
 
 comment_style = {
@@ -32,6 +33,10 @@ comment_style = {
         "/* block_start {blockname} */",
         "/* block_end {blockname} */",
     ),
+    Language.yml: (
+        "# block_start {blockname}",
+        "# block_end {blockname}",
+    ),
 }