@@ -14,10 +14,12 @@
  * file.
  */
 
 #import "OFObject.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 /*! @file */
 
 enum {
 	OF_ZIP_ARCHIVE_ENTRY_COMPRESSION_METHOD_NONE	  = 0,
 	OF_ZIP_ARCHIVE_ENTRY_COMPRESSION_METHOD_DEFLATE	  = 8,
@@ -231,9 +233,11 @@
  * @param data A pointer to a pointer that should be set to the start of the
  *	       extra field with the specified tag
  * @param size A pointer to an uint16_t that should be set to the size
  */
 extern void of_zip_archive_entry_extra_field_find(OFDataArray *extraField,
-    uint16_t tag, uint8_t **data, uint16_t *size);
+    uint16_t tag, __nonnull uint8_t **__nonnull data, __nonnull uint16_t *size);
 #ifdef __cplusplus
 }
 #endif
+
+OF_ASSUME_NONNULL_END