diff --git a/rhodecode/model/pull_request.py b/rhodecode/model/pull_request.py
index b4734db2..21557a6b 100644
--- a/rhodecode/model/pull_request.py
+++ b/rhodecode/model/pull_request.py
@@ -2424,10 +2424,16 @@ class MergeCheck(object):
         if close_branch:
             repo_type = pull_request.target_repo.repo_type
             close_msg = ""
+            branch_name = pull_request.source_ref_parts.name
+            max_branch_length = 20
+            shorten_branch_name = (
+                f"{branch_name[:max_branch_length]}..." if len(branch_name) > max_branch_length else branch_name
+            )
+            message_template = "Source branch '%s' will be {action} before the merge." % shorten_branch_name
             if repo_type == "hg":
-                close_msg = _("Source branch will be closed before the merge.")
+                close_msg = _(message_template.format(action="closed"))
             elif repo_type == "git":
-                close_msg = _("Source branch will be deleted after the merge.")
+                close_msg = _(message_template.format(action="deleted"))
 
             merge_details["close_branch"] = dict(details={}, message=close_msg)