diff --git a/.idea/workspace.xml b/.idea/workspace.xml
new file mode 100644
index 0000000..65246ec
--- /dev/null
+++ b/.idea/workspace.xml
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="AutoImportSettings">
+    <option name="autoReloadType" value="ALL" />
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="152ba934-2a38-403f-8f32-90e587d2358d" name="更改" comment="">
+      <change beforePath="$PROJECT_DIR$/edwards25519.go" beforeDir="false" afterPath="$PROJECT_DIR$/edwards25519.go" afterDir="false" />
+    </list>
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="GOROOT" url="file:///usr/local/go" />
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
+  </component>
+  <component name="ProjectColorInfo">{
+  &quot;associatedIndex&quot;: 1
+}</component>
+  <component name="ProjectId" id="2gUkNBQy8zpSjniLYzokf2zEiQm" />
+  <component name="ProjectViewState">
+    <option name="hideEmptyMiddlePackages" value="true" />
+    <option name="showLibraryContents" value="true" />
+  </component>
+  <component name="PropertiesComponent"><![CDATA[{
+  "keyToString": {
+    "ASKED_ADD_EXTERNAL_FILES": "true",
+    "RunOnceActivity.ShowReadmeOnStart": "true",
+    "RunOnceActivity.go.formatter.settings.were.checked": "true",
+    "RunOnceActivity.go.migrated.go.modules.settings": "true",
+    "RunOnceActivity.go.modules.automatic.dependencies.download": "true",
+    "RunOnceActivity.go.modules.go.list.on.any.changes.was.set": "true",
+    "git-widget-placeholder": "checkInited",
+    "go.import.settings.migrated": "true",
+    "go.sdk.automatically.set": "true",
+    "last_opened_file_path": "/Users/wuxi/code/mine/edwards25519",
+    "node.js.detected.package.eslint": "true",
+    "node.js.selected.package.eslint": "(autodetect)",
+    "nodejs_package_manager_path": "npm"
+  }
+}]]></component>
+  <component name="SharedIndexes">
+    <attachedChunks>
+      <set>
+        <option value="bundled-gosdk-33c477a475b1-b97fc8a1e17c-org.jetbrains.plugins.go.sharedIndexes.bundled-GO-241.14494.238" />
+        <option value="bundled-js-predefined-1d06a55b98c1-74d2a5396914-JavaScript-GO-241.14494.238" />
+      </set>
+    </attachedChunks>
+  </component>
+  <component name="SpellCheckerSettings" RuntimeDictionaries="0" Folders="0" CustomDictionaries="0" DefaultDictionary="应用程序级" UseSingleDictionary="true" transferred="true" />
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="3" />
+  </component>
+  <component name="VgoProject">
+    <settings-migrated>true</settings-migrated>
+  </component>
+</project>
\ No newline at end of file
diff --git a/edwards25519.go b/edwards25519.go
index a744da2..b9513a8 100644
--- a/edwards25519.go
+++ b/edwards25519.go
@@ -46,6 +46,13 @@ func checkInitialized(points ...*Point) {
 	}
 }
 
+func (v *Point) CheckInitialized() bool {
+	if v.x == (field.Element{}) && v.y == (field.Element{}) {
+		return false
+	}
+	return true
+}
+
 type projCached struct {
 	YplusX, YminusX, Z, T2d field.Element
 }