diff --git a/rhodecode/apps/home/views.py b/rhodecode/apps/home/views.py
--- a/rhodecode/apps/home/views.py
+++ b/rhodecode/apps/home/views.py
@@ -32,7 +32,7 @@ from rhodecode.lib.auth import (
     HasRepoGroupPermissionAny, AuthUser)
 from rhodecode.lib.codeblocks import filenode_as_lines_tokens
 from rhodecode.lib.index import searcher_from_config
-from rhodecode.lib.utils2 import safe_unicode, str2bool, safe_int
+from rhodecode.lib.utils2 import safe_unicode, str2bool, safe_int, safe_str
 from rhodecode.lib.vcs.nodes import FileNode
 from rhodecode.model.db import (
     func, true, or_, case, cast, in_filter_generator, String, Session,
@@ -331,7 +331,8 @@ class HomeView(BaseAppView, DataGridAppV
             {
                 'id': obj.pull_request_id,
                 'value': org_query,
-                'value_display': 'pull request: `!{} - {}`'.format(obj.pull_request_id, obj.title[:50]),
+                'value_display': 'pull request: `!{} - {}`'.format(
+                    obj.pull_request_id, safe_str(obj.title[:50])),
                 'type': 'pull_request',
                 'url': h.route_path('pull_requests_global', pull_request_id=obj.pull_request_id)
             }
diff --git a/rhodecode/templates/base/base.mako b/rhodecode/templates/base/base.mako
--- a/rhodecode/templates/base/base.mako
+++ b/rhodecode/templates/base/base.mako
@@ -785,15 +785,15 @@
 
 - Prefix query to allow special search:
 
-   user:admin, to search for usernames, always global
+   <strong>user:</strong>admin, to search for usernames, always global
 
-   user_group:devops, to search for user groups, always global
+   <strong>user_group:</strong>devops, to search for user groups, always global
 
-   pr:303, to search for pull request number, title, or description, always global
+   <strong>pr:</strong>303, to search for pull request number, title, or description, always global
 
-   commit:efced4, to search for commits, scoped to repositories or groups
+   <strong>commit:</strong>efced4, to search for commits, scoped to repositories or groups
 
-   file:models.py, to search for file paths, scoped to repositories or groups
+   <strong>file:</strong>models.py, to search for file paths, scoped to repositories or groups
 
 % if c.template_context['search_context']['repo_id']:
    For advanced full text search visit: <a href="${h.route_path('search_repo',repo_name=c.template_context['search_context']['repo_name'])}">repository search</a>