diff --git a/pyopencl/_cffi.py b/pyopencl/_cffi.py
index 47c0318eb70da8c1acf4869fd6797e97ccc6cc16..b6a25e45ade7a18fc6bec11337f8f838a2aa1dcd 100644
--- a/pyopencl/_cffi.py
+++ b/pyopencl/_cffi.py
@@ -102,6 +102,19 @@ typedef struct _cl_buffer_region {
     size_t                  size;
 } cl_buffer_region;
 
+/* cl_ext.h */
+typedef cl_ulong  cl_device_partition_property_ext;
+typedef cl_uint   cl_image_pitch_info_qcom;
+typedef struct _cl_mem_ext_host_ptr {
+    cl_uint  allocation_type;
+    cl_uint  host_cache_policy;
+} cl_mem_ext_host_ptr;
+typedef struct _cl_mem_ion_host_ptr {
+    cl_mem_ext_host_ptr  ext_host_ptr;
+    int                  ion_filedesc;
+    void*                ion_hostptr;
+} cl_mem_ion_host_ptr;
+
 /* c++ class pointer */
 typedef struct clbase *clobj_t;
 """
diff --git a/pyopencl/cffi_cl.py b/pyopencl/cffi_cl.py
index 32a37354695c30ef174c01c7707ea5ec6cf30291..dbc1ee8872820090cfdb08c11fe8d579eed78631 100644
--- a/pyopencl/cffi_cl.py
+++ b/pyopencl/cffi_cl.py
@@ -618,7 +618,6 @@ class CommandQueue(_Common):
         _handle_error(_lib.command_queue__finish(self.ptr))
     def flush(self):
         _handle_error(_lib.command_queue__flush(self.ptr))
-    # TODO get_context?
     # TODO set_property
 
 class MemoryObjectHolder(_Common):