diff --git a/include/jemalloc/jemalloc_typedefs.h.in b/include/jemalloc/jemalloc_typedefs.h.in
index e5ba7166..1049d7c7 100644
--- a/include/jemalloc/jemalloc_typedefs.h.in
+++ b/include/jemalloc/jemalloc_typedefs.h.in
@@ -2,55 +2,56 @@ typedef struct extent_hooks_s extent_hooks_t;
 
 /*
  * void *
- * extent_alloc(void *new_addr, size_t size, size_t alignment, bool *zero,
- *     bool *commit, unsigned arena_ind);
+ * extent_alloc(extent_hooks_t *extent_hooks, void *new_addr, size_t size,
+ *     size_t alignment, bool *zero, bool *commit, unsigned arena_ind);
  */
 typedef void *(extent_alloc_t)(extent_hooks_t *, void *, size_t, size_t, bool *,
     bool *, unsigned);
 
 /*
  * bool
- * extent_dalloc(void *addr, size_t size, bool committed, unsigned arena_ind);
+ * extent_dalloc(extent_hooks_t *extent_hooks, void *addr, size_t size,
+ *     bool committed, unsigned arena_ind);
  */
 typedef bool (extent_dalloc_t)(extent_hooks_t *, void *, size_t, bool,
     unsigned);
 
 /*
  * bool
- * extent_commit(void *addr, size_t size, size_t offset, size_t length,
- *     unsigned arena_ind);
+ * extent_commit(extent_hooks_t *extent_hooks, void *addr, size_t size,
+ *     size_t offset, size_t length, unsigned arena_ind);
  */
 typedef bool (extent_commit_t)(extent_hooks_t *, void *, size_t, size_t, size_t,
     unsigned);
 
 /*
  * bool
- * extent_decommit(void *addr, size_t size, size_t offset, size_t length,
- *     unsigned arena_ind);
+ * extent_decommit(extent_hooks_t *extent_hooks, void *addr, size_t size,
+ *     size_t offset, size_t length, unsigned arena_ind);
  */
 typedef bool (extent_decommit_t)(extent_hooks_t *, void *, size_t, size_t,
     size_t, unsigned);
 
 /*
  * bool
- * extent_purge(void *addr, size_t size, size_t offset, size_t length,
- *     unsigned arena_ind);
+ * extent_purge(extent_hooks_t *extent_hooks, void *addr, size_t size,
+ *     size_t offset, size_t length, unsigned arena_ind);
  */
 typedef bool (extent_purge_t)(extent_hooks_t *, void *, size_t, size_t, size_t,
     unsigned);
 
 /*
  * bool
- * extent_split(void *addr, size_t size, size_t size_a, size_t size_b,
- *     bool committed, unsigned arena_ind);
+ * extent_split(extent_hooks_t *extent_hooks, void *addr, size_t size,
+ *     size_t size_a, size_t size_b, bool committed, unsigned arena_ind);
  */
 typedef bool (extent_split_t)(extent_hooks_t *, void *, size_t, size_t, size_t,
     bool, unsigned);
 
 /*
  * bool
- * extent_merge(void *addr_a, size_t size_a, void *addr_b, size_t size_b,
- *     bool committed, unsigned arena_ind);
+ * extent_merge(extent_hooks_t *extent_hooks, void *addr_a, size_t size_a,
+ *     void *addr_b, size_t size_b, bool committed, unsigned arena_ind);
  */
 typedef bool (extent_merge_t)(extent_hooks_t *, void *, size_t, void *, size_t,
     bool, unsigned);