diff --git a/Documentation/conf.py b/Documentation/conf.py
index d927737..8b4e545 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -116,6 +116,9 @@
 
             # include/linux/linkage.h:
             "asmlinkage",
+
+            # include/linux/btf.h
+            "__bpf_kfunc",
         ]
 
 else: