diff --git a/rhodecode/controllers/pullrequests.py b/rhodecode/controllers/pullrequests.py
--- a/rhodecode/controllers/pullrequests.py
+++ b/rhodecode/controllers/pullrequests.py
@@ -492,7 +492,7 @@ class PullrequestsController(BaseRepoCon
             msg = PullRequestModel.UPDATE_STATUS_MESSAGES[resp.reason]
             warning_reasons = [
                 UpdateFailureReason.NO_CHANGE,
-                UpdateFailureReason.WRONG_REF_TPYE,
+                UpdateFailureReason.WRONG_REF_TYPE,
             ]
             category = 'warning' if resp.reason in warning_reasons else 'error'
             h.flash(msg, category=category)
diff --git a/rhodecode/lib/vcs/backends/base.py b/rhodecode/lib/vcs/backends/base.py
--- a/rhodecode/lib/vcs/backends/base.py
+++ b/rhodecode/lib/vcs/backends/base.py
@@ -130,7 +130,7 @@ class UpdateFailureReason(object):
     NO_CHANGE = 2
 
     # The pull request has a reference type that is not supported for update.
-    WRONG_REF_TPYE = 3
+    WRONG_REF_TYPE = 3
 
     # Update failed because the target reference is missing.
     MISSING_TARGET_REF = 4
diff --git a/rhodecode/model/pull_request.py b/rhodecode/model/pull_request.py
--- a/rhodecode/model/pull_request.py
+++ b/rhodecode/model/pull_request.py
@@ -118,9 +118,9 @@ class PullRequestModel(BaseModel):
             'Pull request update failed because of an unknown error.'),
         UpdateFailureReason.NO_CHANGE: lazy_ugettext(
             'No update needed because the source and target have not changed.'),
-        UpdateFailureReason.WRONG_REF_TPYE: lazy_ugettext(
+        UpdateFailureReason.WRONG_REF_TYPE: lazy_ugettext(
             'Pull request cannot be updated because the reference type is '
-            'not supported for an update.'),
+            'not supported for an update. Only Branch, Tag or Bookmark is allowed.'),
         UpdateFailureReason.MISSING_TARGET_REF: lazy_ugettext(
             'This pull request cannot be updated because the target '
             'reference is missing.'),
@@ -594,7 +594,7 @@ class PullRequestModel(BaseModel):
                 pull_request, source_ref_type)
             return UpdateResponse(
                 executed=False,
-                reason=UpdateFailureReason.WRONG_REF_TPYE,
+                reason=UpdateFailureReason.WRONG_REF_TYPE,
                 old=pull_request, new=None, changes=None,
                 source_changed=False, target_changed=False)