diff --git a/docs/contributing/documentation-modes.rst b/docs/contributing/documentation_modes.rst
similarity index 100%
rename from docs/contributing/documentation-modes.rst
rename to docs/contributing/documentation_modes.rst
diff --git a/wagtail/admin/templates/wagtailadmin/shared/dialog/dialog-toggle.html b/wagtail/admin/templates/wagtailadmin/shared/dialog/dialog_toggle.html
similarity index 100%
rename from wagtail/admin/templates/wagtailadmin/shared/dialog/dialog-toggle.html
rename to wagtail/admin/templates/wagtailadmin/shared/dialog/dialog_toggle.html
diff --git a/wagtail/admin/templates/wagtailadmin/shared/dialog/end-dialog.html b/wagtail/admin/templates/wagtailadmin/shared/dialog/end_dialog.html
similarity index 100%
rename from wagtail/admin/templates/wagtailadmin/shared/dialog/end-dialog.html
rename to wagtail/admin/templates/wagtailadmin/shared/dialog/end_dialog.html
diff --git a/wagtail/admin/templatetags/wagtailadmin_tags.py b/wagtail/admin/templatetags/wagtailadmin_tags.py
index 2875b06aca..559eff5be9 100644
--- a/wagtail/admin/templatetags/wagtailadmin_tags.py
+++ b/wagtail/admin/templatetags/wagtailadmin_tags.py
@@ -911,13 +911,13 @@ def dialog(
 
 
 # Closing tag for dialog tag {% enddialog %}
-@register.inclusion_tag("wagtailadmin/shared/dialog/end-dialog.html")
+@register.inclusion_tag("wagtailadmin/shared/dialog/end_dialog.html")
 def enddialog():
     return
 
 
 # Button used to open dialogs
-@register.inclusion_tag("wagtailadmin/shared/dialog/dialog-toggle.html")
+@register.inclusion_tag("wagtailadmin/shared/dialog/dialog_toggle.html")
 def dialog_toggle(dialog_id, class_name="", text=None):
     if not dialog_id:
         raise ValueError("You must supply the dialog ID")