diff --git a/cmd/comment.go b/cmd/comment.go
index fdf7e06..febefbf 100644
--- a/cmd/comment.go
+++ b/cmd/comment.go
@@ -3,6 +3,7 @@ package cmd
 import (
 	"encoding/json"
 	"fmt"
+	"os"
 	"strings"
 
 	"github.com/4ier/notion-cli/internal/client"
@@ -317,9 +318,106 @@ func init() {
 	commentListCmd.Flags().Bool("all", false, "Fetch all pages of results")
 	commentAddCmd.Flags().String("text", "", "Comment text")
 	commentAddCmd.Flags().StringArray("mention-user", nil, "Mention a Notion user by ID (repeatable)")
+	commentUpdateCmd.Flags().String("text", "", "New comment text (required)")
+	commentUpdateCmd.Flags().StringArray("mention-user", nil, "Mention a Notion user by ID (repeatable)")
 
 	commentCmd.AddCommand(commentListCmd)
 	commentCmd.AddCommand(commentAddCmd)
 	commentCmd.AddCommand(commentGetCmd)
 	commentCmd.AddCommand(commentReplyCmd)
+	commentCmd.AddCommand(commentUpdateCmd)
+	commentCmd.AddCommand(commentDeleteCmd)
+}
+
+var commentUpdateCmd = &cobra.Command{
+	Use:   "update <comment-id>",
+	Short: "Edit an existing comment's text",
+	Long: `Edit the text of an existing comment.
+
+Wraps PATCH /v1/comments/:id (added in Notion's 2025 API). The new
+rich_text is built the same way as 'comment add' — --mention-user works
+if you need to keep or add @mentions.
+
+Examples:
+  notion comment update abc123 --text "Fixed typo in previous comment"
+  notion comment update abc123 --text "with mention" --mention-user <user-id>`,
+	Args: cobra.ExactArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		token, err := getToken()
+		if err != nil {
+			return err
+		}
+
+		commentID := strings.TrimSpace(args[0])
+		text, _ := cmd.Flags().GetString("text")
+		mentionUserIDs, _ := cmd.Flags().GetStringArray("mention-user")
+
+		if text == "" && len(mentionUserIDs) == 0 {
+			return fmt.Errorf("--text or --mention-user is required")
+		}
+
+		c := client.New(token)
+		c.SetDebug(debugMode)
+
+		data, err := c.UpdateComment(commentID, text, mentionUserIDs)
+		if err != nil {
+			return fmt.Errorf("update comment: %w", err)
+		}
+
+		if outputFormat == "json" {
+			var result map[string]interface{}
+			if err := json.Unmarshal(data, &result); err != nil {
+				return fmt.Errorf("parse response: %w", err)
+			}
+			return render.JSON(result)
+		}
+
+		fmt.Println("✓ Comment updated")
+		return nil
+	},
+}
+
+var commentDeleteCmd = &cobra.Command{
+	Use:   "delete <comment-id ...>",
+	Short: "Delete one or more comments",
+	Long: `Delete comments by id. Accepts multiple ids for bulk removal,
+mirroring 'block delete' — per-id errors are printed but do not stop
+the batch.
+
+Note: deleting the anchor (first) comment of a discussion removes the
+whole thread. Deleting a reply removes just that one reply.
+
+Wraps DELETE /v1/comments/:id (added in Notion's 2025 API).
+
+Examples:
+  notion comment delete abc123
+  notion comment delete abc123 def456 ghi789`,
+	Args: cobra.MinimumNArgs(1),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		token, err := getToken()
+		if err != nil {
+			return err
+		}
+
+		c := client.New(token)
+		c.SetDebug(debugMode)
+
+		deleted := 0
+		for _, id := range args {
+			id = strings.TrimSpace(id)
+			if id == "" {
+				continue
+			}
+			if _, err := c.DeleteComment(id); err != nil {
+				fmt.Fprintf(os.Stderr, "✗ Failed to delete %s: %v\n", id, err)
+				continue
+			}
+			deleted++
+		}
+
+		if outputFormat != "json" {
+			fmt.Printf("✓ %d comment(s) deleted\n", deleted)
+		}
+		return nil
+	},
 }
diff --git a/cmd/comment_update_delete_test.go b/cmd/comment_update_delete_test.go
new file mode 100644
index 0000000..7eac1b0
--- /dev/null
+++ b/cmd/comment_update_delete_test.go
@@ -0,0 +1,37 @@
+package cmd
+
+import (
+	"testing"
+)
+
+func TestCommentUpdateCmd_RequiresTextOrMention(t *testing.T) {
+	if commentUpdateCmd.Short == "" {
+		t.Error("update short help missing")
+	}
+	// Sanity: the command is registered under the parent.
+	for _, expected := range []string{"update", "delete"} {
+		found := false
+		for _, sub := range commentCmd.Commands() {
+			if sub.Name() == expected {
+				found = true
+				break
+			}
+		}
+		if !found {
+			t.Errorf("comment %s subcommand not registered", expected)
+		}
+	}
+}
+
+func TestCommentDeleteCmd_AcceptsVariadic(t *testing.T) {
+	// Args validator should accept 1+ ids.
+	if err := commentDeleteCmd.Args(commentDeleteCmd, []string{"id1"}); err != nil {
+		t.Errorf("one id should be valid: %v", err)
+	}
+	if err := commentDeleteCmd.Args(commentDeleteCmd, []string{"id1", "id2", "id3"}); err != nil {
+		t.Errorf("multiple ids should be valid: %v", err)
+	}
+	if err := commentDeleteCmd.Args(commentDeleteCmd, []string{}); err == nil {
+		t.Errorf("zero ids should fail")
+	}
+}
diff --git a/internal/client/client.go b/internal/client/client.go
index a3b7014..501ec16 100644
--- a/internal/client/client.go
+++ b/internal/client/client.go
@@ -301,6 +301,23 @@ func (c *Client) AddComment(pageID, text string, mentionUserIDs []string) ([]byt
 	return c.Post("/v1/comments", body)
 }
 
+// UpdateComment edits the rich_text body of an existing comment.
+// Wraps PATCH /v1/comments/:id (added in Notion API 2025).
+func (c *Client) UpdateComment(commentID, text string, mentionUserIDs []string) ([]byte, error) {
+	body := map[string]interface{}{
+		"rich_text": buildCommentRichText(text, mentionUserIDs),
+	}
+	return c.Patch("/v1/comments/"+commentID, body)
+}
+
+// DeleteComment removes a comment by id.
+// Wraps DELETE /v1/comments/:id (added in Notion API 2025). When the
+// target is the anchor comment of a discussion, Notion removes the whole
+// thread; otherwise it removes just that one reply.
+func (c *Client) DeleteComment(commentID string) ([]byte, error) {
+	return c.Delete("/v1/comments/" + commentID)
+}
+
 func buildCommentRichText(text string, mentionUserIDs []string) []map[string]interface{} {
 	var richText []map[string]interface{}