diff --git a/include/pemagine/pemagine.h b/include/pemagine/pemagine.h
index 4c1fcf4..67159d0 100644
--- a/include/pemagine/pemagine.h
+++ b/include/pemagine/pemagine.h
@@ -151,7 +151,7 @@ typedef int pe_enum_image_import_hdrs_callback(
 	enum pe_callback_reason		reason,
 	void *				context);
 
-/* library functions */
+/* image: low-level api */
 pe_api struct pe_raw_image_dos_hdr *	pe_get_image_dos_hdr_addr	(const void * base);
 pe_api struct pe_raw_coff_file_hdr *	pe_get_image_coff_hdr_addr	(const void * base);
 pe_api union  pe_raw_opt_hdr *		pe_get_image_opt_hdr_addr	(const void * base);
@@ -160,10 +160,15 @@ pe_api struct pe_raw_sec_hdr *		pe_get_image_section_tbl_addr	(const void * base
 pe_api struct pe_raw_sec_hdr *		pe_get_image_named_section_addr	(const void * base, const char * name);
 pe_api struct pe_raw_export_hdr *	pe_get_image_export_hdr_addr	(const void * base, uint32_t * sec_size);
 pe_api struct pe_raw_import_hdr *	pe_get_image_import_dir_addr	(const void * base, uint32_t * sec_size);
-pe_api void *				pe_get_image_special_hdr_addr	(const void * base, uint32_t ordinal, uint32_t * sec_size);
+
+/* image: high-level api */
 pe_api void *				pe_get_image_entry_point_addr	(const void * base);
+pe_api void *				pe_get_image_special_hdr_addr	(const void * base, uint32_t ordinal, uint32_t * sec_size);
 pe_api int				pe_get_image_stack_heap_info	(const void * base, struct pe_stack_heap_info *);
 
+/* image: exports api */
+pe_api char *				pe_get_symbol_name		(const void * base, const void * sym_addr);
+pe_api struct pe_ldr_tbl_entry *	pe_get_symbol_module_info	(const void * sym_addr);
 pe_api void *				pe_get_procedure_address	(const void * base, const char * name);
 pe_api int				pe_get_export_symbol_info	(const void * base, const char * name, struct pe_export_sym *);
 pe_api int				pe_enum_image_exports		(const void * base,
@@ -171,20 +176,22 @@ pe_api int				pe_enum_image_exports		(const void * base,
 									 struct pe_export_sym *,
 									 void * ctx);
 
+/* image: imports api */
+pe_api char *				pe_get_import_symbol_info	(const void * sym_addr,
+									 struct pe_ldr_tbl_entry ** ldr_tbl_entry);
+
 pe_api int				pe_enum_image_import_hdrs	(const void * base,
 									 pe_enum_image_import_hdrs_callback *,
 									 void * ctx);
 
-pe_api char *				pe_get_symbol_name		(const void * base, const void * sym_addr);
-pe_api struct pe_ldr_tbl_entry *	pe_get_symbol_module_info	(const void * sym_addr);
-pe_api char *				pe_get_import_symbol_info	(const void * sym_addr,
-									 struct pe_ldr_tbl_entry ** ldr_tbl_entry);
-
+/* process: address space api */
 pe_api int				pe_enum_modules_in_load_order	(pe_enum_modules_callback *, void * ctx);
 pe_api int				pe_enum_modules_in_memory_order	(pe_enum_modules_callback *, void * ctx);
 pe_api int				pe_enum_modules_in_init_order	(pe_enum_modules_callback *, void * ctx);
 pe_api void *				pe_get_module_handle		(const wchar16_t * name);
 pe_api void *				pe_get_first_module_handle	(void);
+
+/* process: system api */
 pe_api void *				pe_get_ntdll_module_handle	(void);
 pe_api void *				pe_get_kernel32_module_handle	(void);