cmd/sgblog-comment-add/main.go | 8 +++++++-

diff --git a/cmd/sgblog-comment-add/main.go b/cmd/sgblog-comment-add/main.go
index 97408a467ebee8f6aa9a309f4c610a69599e5f99265acaf6898a644851ad66eb..e4a088eb492e9bf94acc1a299c95b5b59a11bee5e2917183d55f79ace9250a39 100644
--- a/cmd/sgblog-comment-add/main.go
+++ b/cmd/sgblog-comment-add/main.go
@@ -30,6 +30,7 @@ 	"mime"
 	"net/mail"
 	"os"
 	"os/exec"
+	"regexp"
 	"strconv"
 	"strings"
 	"syscall"
@@ -38,6 +39,8 @@
 	"go.cypherpunks.ru/netstring/v2"
 	"go.stargrave.org/sgblog"
 )
+
+var hashFinder = regexp.MustCompile("([0-9a-f]{40})")
 
 // Remove various whitespaces and excess lines, because git-notes-add
 // will remove and we have to know exact bytes count
@@ -116,7 +119,10 @@ 	if err != nil {
 		log.Fatal(err)
 	}
 
-	subj = strings.TrimPrefix(subj, "Re: ")
+	subj = hashFinder.FindString(subj)
+	if subj == "" {
+		log.Fatal("no commit hash found in subject")
+	}
 	if h, err := hex.DecodeString(subj); err != nil || len(h) != sha1.Size {
 		os.Exit(0)
 	}