diff --git a/docs/xml/Android.Telephony.Euicc/Operation.xml b/docs/xml/Android.Telephony.Euicc/Operation.xml
index f518f2ed4..cccff8f39 100644
--- a/docs/xml/Android.Telephony.Euicc/Operation.xml
+++ b/docs/xml/Android.Telephony.Euicc/Operation.xml
@@ -11,8 +11,33 @@
     <BaseTypeName>System.Enum</BaseTypeName>
   </Base>
   <Docs>
-    <summary>To be added.</summary>
-    <remarks>To be added.</remarks>
+    <summary>Operation categories used in eUICC detailed error codes.</summary>
+    <remarks>
+      <para>An operation category identifies the type of operation that was in progress when an error occurred. In a detailed result code, it occupies the first byte; the remaining three bytes contain error-specific data.</para>
+      <para>
+        <format type="text/html">
+          <a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#EXTRA_EMBEDDED_SUBSCRIPTION_DETAILED_CODE" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.EXTRA_EMBEDDED_SUBSCRIPTION_DETAILED_CODE</code>.</a>
+        </format>
+      </para>
+      <para>The values correspond to these <c>EuiccManager</c> operation constants:</para>
+      <para><c>Apdu</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_APDU" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_APDU</code>.</a></format></para>
+      <para><c>Download</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_DOWNLOAD" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_DOWNLOAD</code>.</a></format></para>
+      <para><c>EuiccCard</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_EUICC_CARD" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_EUICC_CARD</code>.</a></format></para>
+      <para><c>EuiccGsma</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_EUICC_GSMA" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_EUICC_GSMA</code>.</a></format></para>
+      <para><c>Http</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_HTTP" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_HTTP</code>.</a></format></para>
+      <para><c>Metadata</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_METADATA" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_METADATA</code>.</a></format></para>
+      <para><c>SimSlot</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_SIM_SLOT" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_SIM_SLOT</code>.</a></format></para>
+      <para><c>Smdx</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_SMDX" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_SMDX</code>.</a></format></para>
+      <para><c>SmdxSubjectReasonCode</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_SMDX_SUBJECT_REASON_CODE" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_SMDX_SUBJECT_REASON_CODE</code>.</a></format></para>
+      <para><c>Switch</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_SWITCH" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_SWITCH</code>.</a></format></para>
+      <para><c>System</c>: <format type="text/html"><a href="https://developer.android.com/reference/android/telephony/euicc/EuiccManager#OPERATION_SYSTEM" title="Reference documentation">Java documentation for <code>android.telephony.euicc.EuiccManager.OPERATION_SYSTEM</code>.</a></format></para>
+      <para>
+        Portions of this page are modifications based on work created and shared by the
+        <format type="text/html"><a href="https://developers.google.com/terms/site-policies" title="Android Open Source Project">Android Open Source Project</a></format>
+        and used according to terms described in the
+        <format type="text/html"><a href="https://creativecommons.org/licenses/by/2.5/" title="Creative Commons 2.5 Attribution License">Creative Commons 2.5 Attribution License.</a></format>
+      </para>
+    </remarks>
   </Docs>
   <Members>
     <Member MemberName="Apdu">
@@ -40,7 +65,7 @@
       </ReturnValue>
       <MemberValue>8</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>An APDU command execution error, such as a channel-opening failure or a non-success APDU response.</summary>
       </Docs>
     </Member>
     <Member MemberName="Download">
@@ -68,7 +93,7 @@
       </ReturnValue>
       <MemberValue>5</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>A profile download error.</summary>
       </Docs>
     </Member>
     <Member MemberName="EuiccCard">
@@ -96,7 +121,7 @@
       </ReturnValue>
       <MemberValue>3</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>An eUICC card error.</summary>
       </Docs>
     </Member>
     <Member MemberName="EuiccGsma">
@@ -124,7 +149,7 @@
       </ReturnValue>
       <MemberValue>7</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>An error returned by the eUICC while running a GSMA SGP.22 ES10x function.</summary>
       </Docs>
     </Member>
     <Member MemberName="Http">
@@ -152,7 +177,7 @@
       </ReturnValue>
       <MemberValue>11</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>An HTTP error.</summary>
       </Docs>
     </Member>
     <Member MemberName="Metadata">
@@ -180,7 +205,7 @@
       </ReturnValue>
       <MemberValue>6</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>A subscription metadata error.</summary>
       </Docs>
     </Member>
     <Member MemberName="SimSlot">
@@ -208,7 +233,7 @@
       </ReturnValue>
       <MemberValue>2</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>A SIM slot error, such as a failed slot switch or physical slot access.</summary>
       </Docs>
     </Member>
     <Member MemberName="Smdx">
@@ -236,7 +261,7 @@
       </ReturnValue>
       <MemberValue>9</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>An SMDX (SMDP/SMDS) error.</summary>
       </Docs>
     </Member>
     <Member MemberName="SmdxSubjectReasonCode">
@@ -264,7 +289,7 @@
       </ReturnValue>
       <MemberValue>10</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>SMDX subject and reason codes from GSMA SGP.22.</summary>
       </Docs>
     </Member>
     <Member MemberName="Switch">
@@ -292,7 +317,7 @@
       </ReturnValue>
       <MemberValue>4</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>A generic profile-switching error.</summary>
       </Docs>
     </Member>
     <Member MemberName="System">
@@ -320,7 +345,7 @@
       </ReturnValue>
       <MemberValue>1</MemberValue>
       <Docs>
-        <summary>To be added.</summary>
+        <summary>An internal system error.</summary>
       </Docs>
     </Member>
   </Members>