diff --git a/sp-files/Makefile.sp b/sp-files/Makefile.sp
index beaf79df..c924358c 100644
--- a/sp-files/Makefile.sp
+++ b/sp-files/Makefile.sp
@@ -109,7 +109,7 @@ sp-clean-doc:
 sp-spellcheck: sp-spellcheck-install
 	. $(VENV) ; python3 -m pyspelling -c $(SPHINXDIR)/spellingcheck.yaml -j $(shell nproc)
 
-sp-spelling: sp-html sp-spellcheck
+sp-spelling: sp-clean-doc sp-html sp-spellcheck
 
 sp-linkcheck: sp-install
 	. $(VENV) ; $(SPHINXBUILD) -b linkcheck "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) || { grep --color -F "[broken]" "$(BUILDDIR)/output.txt"; exit 1; }
diff --git a/sp-files/conf.py b/sp-files/conf.py
index 0eefa2bb..e1a40a20 100644
--- a/sp-files/conf.py
+++ b/sp-files/conf.py
@@ -119,12 +119,14 @@
 
     # Your Discourse instance URL
     #
-    # TODO: Change to your Discourse instance URL or leave empty.
+    # TODO: Change to your Discourse instance URL and category or leave empty.
+    #       The default setting becomes https://discourse.ubuntu.com/c/desktop/
     #
     # NOTE: If set, adding ':discourse: 123' to an .rst file
     #       will add a link to Discourse topic 123 at the bottom of the page.
 
     'discourse': 'https://discourse.ubuntu.com',
+    'category': 'desktop',
 
 
     # Your Mattermost channel URL