diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..94a25f7
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 53310d4..4a4a418 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,7 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ChangeListManager">
-    <list default="true" id="aa6c2199-1a12-49e5-87b6-7ea25345c196" name="Default" comment="" />
+    <list default="true" id="aa6c2199-1a12-49e5-87b6-7ea25345c196" name="Default" comment="">
+      <change type="NEW" beforePath="" afterPath="$PROJECT_DIR$/.idea/vcs.xml" />
+      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
+      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/README.md" afterPath="$PROJECT_DIR$/README.md" />
+    </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="TRACKING_ENABLED" value="true" />
     <option name="SHOW_DIALOG" value="false" />
@@ -15,11 +19,11 @@
   <component name="ExecutionTargetManager" SELECTED_TARGET="default_target" />
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="450">
-      <file leaf-file-name="read_a2.py" pinned="false" current-in-tab="true">
+      <file leaf-file-name="read_a2.py" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/read_a2.py">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="2304">
-              <caret line="64" column="16" lean-forward="true" selection-start-line="64" selection-start-column="16" selection-end-line="64" selection-end-column="16" />
+            <state relative-caret-position="-1620">
+              <caret line="3" column="0" lean-forward="true" selection-start-line="3" selection-start-column="0" selection-end-line="32" selection-end-column="66" />
               <folding>
                 <element signature="e#0#13#0" expanded="true" />
               </folding>
@@ -27,6 +31,16 @@
           </provider>
         </entry>
       </file>
+      <file leaf-file-name="README.md" pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/README.md">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="540">
+              <caret line="15" column="27" lean-forward="true" selection-start-line="15" selection-start-column="27" selection-end-line="15" selection-end-column="27" />
+              <folding />
+            </state>
+          </provider>
+        </entry>
+      </file>
       <file leaf-file-name="__builtin__.py" pinned="false" current-in-tab="false">
         <entry file="file://$USER_HOME$/.PyCharm2017.1/system/python_stubs/-762174762/__builtin__.py">
           <provider selected="true" editor-type-id="text-editor">
@@ -73,10 +87,14 @@
       <find>h</find>
     </findStrings>
   </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
   <component name="IdeDocumentHistory">
     <option name="CHANGED_PATHS">
       <list>
         <option value="$PROJECT_DIR$/read_a2.py" />
+        <option value="$PROJECT_DIR$/README.md" />
       </list>
     </option>
   </component>
@@ -92,6 +110,7 @@
     <option name="width" value="1936" />
     <option name="height" value="1056" />
   </component>
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
   <component name="ProjectView">
     <navigator currentView="ProjectPane" proportions="" version="1">
       <flattenPackages />
@@ -338,14 +357,15 @@
   </component>
   <component name="ToolWindowManager">
     <frame x="-8" y="-8" width="1936" height="1056" extended-state="6" />
+    <editor active="true" />
     <layout>
       <window_info id="TODO" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="6" side_tool="false" content_ui="tabs" />
       <window_info id="Event Log" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="true" content_ui="tabs" />
-      <window_info id="Version Control" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="false" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
+      <window_info id="Version Control" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
       <window_info id="Python Console" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
-      <window_info id="Run" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.3295325" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
+      <window_info id="Run" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.33028573" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
       <window_info id="Terminal" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="7" side_tool="false" content_ui="tabs" />
-      <window_info id="Project" active="true" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.18534483" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
+      <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.18534483" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
       <window_info id="Database" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
       <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.3295325" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
       <window_info id="Structure" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
@@ -425,13 +445,21 @@
     </entry>
     <entry file="file://$PROJECT_DIR$/read_a2.py">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="2304">
-          <caret line="64" column="16" lean-forward="true" selection-start-line="64" selection-start-column="16" selection-end-line="64" selection-end-column="16" />
+        <state relative-caret-position="-1620">
+          <caret line="3" column="0" lean-forward="true" selection-start-line="3" selection-start-column="0" selection-end-line="32" selection-end-column="66" />
           <folding>
             <element signature="e#0#13#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/README.md">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="540">
+          <caret line="15" column="27" lean-forward="true" selection-start-line="15" selection-start-column="27" selection-end-line="15" selection-end-column="27" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
   </component>
 </project>
\ No newline at end of file
diff --git a/README.md b/README.md
index 24ddb16..4578ee7 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,45 @@
 # aria-control-file-parser
+
+parse aria2c control file from cmd line.
+
+I just find someone, also find a way to convert .aria2 file to magnet link.
+
+just see this issue(https://github.com/aria2/aria2/issues/792).
+
+read the aria technical notes, the .aria2 (Control File) contain the hash info of
+the magnet link, so just parse the file.
+
+also @alphatr write a tool transform .aria2 file to a magnet link use javascript.
+
+
+```
+# ================================================================
+#  0                   1                   2                   3
+#  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+# +---+-------+-------+-------------------------------------------+
+# |VER|  EXT  |INFO   |INFO HASH ...                              |
+# |(2)|  (4)  |HASH   | (INFO HASH LENGTH)                        |
+# |   |       |LENGTH |                                           |
+# |   |       |  (4)  |                                           |
+# +---+---+---+-------+---+---------------+-------+---------------+
+# |PIECE  |TOTAL LENGTH   |UPLOAD LENGTH  |BIT-   |BITFIELD ...   |
+# |LENGTH |     (8)       |     (8)       |FIELD  | (BITFIELD     |
+# |  (4)  |               |               |LENGTH |  LENGTH)      |
+# |       |               |               |  (4)  |               |
+# +-------+-------+-------+-------+-------+-------+---------------+
+# |NUM    |INDEX  |LENGTH |PIECE  |PIECE BITFIELD ...             |
+# |IN-    |  (4)  |  (4)  |BIT-   | (PIECE BITFIELD LENGTH)       |
+# |FLIGHT |       |       |FIELD  |                               |
+# |PIECE  |       |       |LENGTH |                               |
+# |  (4)  |       |       |  (4)  |                               |
+# +-------+-------+-------+-------+-------------------------------+
+#
+#         ^                                                       ^
+#         |                                                       |
+#         +-------------------------------------------------------+
+#                 Repeated in (NUM IN-FLIGHT) PIECE times
+
+# more detail
+# https://aria2.github.io/manual/en/html/technical-notes.html
+# ================================================================
+```
\ No newline at end of file