More docs. Glossary.
diff --git a/src/gallium/docs/source/conf.py b/src/gallium/docs/source/conf.py
index 7ff4896..2b974b7 100644
--- a/src/gallium/docs/source/conf.py
+++ b/src/gallium/docs/source/conf.py
@@ -83,6 +83,9 @@
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = 'sphinx'
 
+# The language for highlighting source code.
+highlight_language = 'c'
+
 # A list of ignored prefixes for module index sorting.
 #modindex_common_prefix = []