diff --git a/include/grpc/support/slice.h b/include/grpc/support/slice.h
index 9026602f15f5438b070b5d3ad1f2d27818dbc5b9..3ee103bfb9c223fe1f54e8ee82f113232d0bff0b 100644
--- a/include/grpc/support/slice.h
+++ b/include/grpc/support/slice.h
@@ -110,8 +110,9 @@ gpr_slice gpr_slice_ref(gpr_slice s);
 /* Decrement the ref count of s.  If the ref count of s reaches zero, all
    slices sharing the ref count are destroyed, and considered no longer
    initialized.  If s is ultimately derived from a call to gpr_slice_new(start,
-   len, dest) where dest!=NULL , then (*dest)(start, len) is called.  Requires
-   s initialized.  */
+   len, dest) where dest!=NULL , then (*dest)(start) is called, else if s is
+   ultimately derived from a call to gpr_slice_new_with_len(start, len, dest)
+   where dest!=NULL , then (*dest)(start, len).  Requires s initialized.  */
 void gpr_slice_unref(gpr_slice s);
 
 /* Create a slice pointing at some data. Calls malloc to allocate a refcount