diff --git a/readme.txt b/readme.txt
index 7ebd544..6672cb7 100644
--- a/readme.txt
+++ b/readme.txt
@@ -32,6 +32,8 @@ e.g.
 
 == Changelog ==
 
+[ Specification Change ] Disable HTML editing for blocks with inner blocks, as the blocks are broken.
+
 = 0.1.2 =
 [ Fix ] Translation
 
diff --git a/src/copy-button-wrap/block.json b/src/copy-button-wrap/block.json
index 8c9d6c8..91d40bd 100644
--- a/src/copy-button-wrap/block.json
+++ b/src/copy-button-wrap/block.json
@@ -11,6 +11,7 @@
 		}
 	},
 	"supports": {
+		"html": false,
 		"className": true,
 		"spacing": {
 			"margin": ["top", "bottom"]
diff --git a/src/copy-target/block.json b/src/copy-target/block.json
index 0f4ed03..48ce756 100644
--- a/src/copy-target/block.json
+++ b/src/copy-target/block.json
@@ -9,6 +9,7 @@
 		"vk-simple-copy-block/simple-copy"
 	],
 	"supports": {
+		"html": false,
 		"className": true,
 		"spacing": {
 			"padding": true,
@@ -31,4 +32,4 @@
 		"reusable": false
 	},
 	"editorScript": "file:./index.js"
-}
\ No newline at end of file
+}
diff --git a/src/simple-copy/block.json b/src/simple-copy/block.json
index 645119b..dd68436 100644
--- a/src/simple-copy/block.json
+++ b/src/simple-copy/block.json
@@ -11,6 +11,7 @@
 		}
 	},
 	"supports": {
+		"html": false,
 		"align": [
 			"wide",
 			"full"
@@ -24,4 +25,4 @@
 	"editorScript": "file:./index.js",
 	"editorStyle": "file:./index.css",
 	"style": "file:./style-index.css"
-}
\ No newline at end of file
+}