diff --git a/Doxyfile b/Doxyfile
index eafa01a..c472164 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -16,7 +16,7 @@
 
 # This file only creates documentation for the most important parts of the
 # external-visible API.
-INPUT = include/core include/effects
+INPUT = include/core include/effects include/gpu
 EXTRACT_PRIVATE = YES
 EXTRACT_STATIC = YES