diff --git a/windows/security/threat-protection/microsoft-defender-atp/alerts-queue.md b/windows/security/threat-protection/microsoft-defender-atp/alerts-queue.md
index da4a174d2c..5d013d5737 100644
--- a/windows/security/threat-protection/microsoft-defender-atp/alerts-queue.md
+++ b/windows/security/threat-protection/microsoft-defender-atp/alerts-queue.md
@@ -63,6 +63,30 @@ So, for example:
 -	An alert about malware detected while executing which can pose a threat not only to the individual machine but to the organization, regardless if it was eventually blocked, may be ranked as "Medium" or "High".
 -	Suspicious behavioral alerts which were not blocked or remediated will be ranked "Low", "Medium" or "High" following the same organizational threat considerations.
 
+#### Understanding alert categories
+We've redefined the alert categories to align to the [enterprise attack tactics](https://attack.mitre.org/tactics/enterprise/) in the [MITRE ATT&CK matrix](https://attack.mitre.org/). New category names apply to all new alerts. Existing alerts will retain the previous category names.
+
+The table below lists the current categories and how they generally map to previous categories. 
+
+| New category | Previous categories | Detected threat activity or component |
+|----------------------|----------------------|-------------|
+| Collection           | - | Locating and collecting data for exfiltration |
+| Command and control  | CommandAndControl | Connecting to attacker-controlled network infrastructure to relay data or receive commands |
+| Credential access    | CredentialTheft | Obtaining valid credentials to extend control over devices and other resources in the network |
+| Defense evasion      | - | Avoiding security controls by, for example, turning off security apps, deleting implants, and running rootkits |
+| Discovery            | Reconnaissance, WebFingerprinting | Gathering information about important devices and resources, such as administrator computers, domain controllers, and file servers |
+| Execution            | Delivery, MalwareDownload | Launching attacker tools and malicious code, including RATs and backdoors |
+| Exfiltration         | Exfiltration | Extracting data from the network to an external, attacker-controlled location |
+| Exploit              | Exploit | Exploit code and possible exploitation activity |
+| Initial access       | SocialEngineering, WebExploit, DocumentExploit | Gaining initial entry to the target network, usually involving password-guessing, exploits, or phishing emails |
+| Lateral movement     | LateralMovement, NetworkPropagation | Moving between devices in the target network to reach critical resources or gain network persistence |
+| Malware              | Malware, Backdoor, Trojan, TrojanDownloader, CredentialStealing, Weaponization, RemoteAccessTool | Backdoors, trojans, and other types of malicious code |
+| Persistence          | Installation, Persistence | Creating autostart extensibility points (ASEPs) to remain active and survive system restarts |
+| Privilege escalation | PrivilegeEscalation | Obtaining higher permission levels for code by running it in the context of a privileged process or account |
+| Ransomware           | Ransomware | Malware that encrypts files and extorts payment to restore access |
+| Suspicious activity  | General, None, NotApplicable, EnterprisePolicy, SuspiciousNetworkTraffic | Atypicaly activity that could be malware activity or part of an attack |
+| Unwanted software    | UnwantedSoftware | Low-reputation apps and apps that impact productivity and the user experience; detected as potentially unwanted applications (PUAs) |
+
 ### Status
 You can choose to limit the list of alerts based on their status.
 
diff --git a/windows/security/threat-protection/microsoft-defender-atp/alerts.md b/windows/security/threat-protection/microsoft-defender-atp/alerts.md
index 05fcb78399..3817d34a9a 100644
--- a/windows/security/threat-protection/microsoft-defender-atp/alerts.md
+++ b/windows/security/threat-protection/microsoft-defender-atp/alerts.md
@@ -46,7 +46,7 @@ status | Enum | Specifies the current status of the alert. Possible values are:
 investigationState | Nullable Enum | The current state of the investigation. Possible values are: 'Unknown', 'Terminated', 'SuccessfullyRemediated', 'Benign Failed PartiallyRemediated', 'Running', 'PendingApproval', 'PendingResource', 'PartiallyInvestigated', 'TerminatedByUser', 'TerminatedBySystem', 'Queued', 'InnerFailure', 'PreexistingAlert', 'UnsupportedOs', 'UnsupportedAlertType', 'SuppressedAlert' .
 classification | Nullable Enum | Specification of the alert. Possible values are: 'Unknown', 'FalsePositive', 'TruePositive'. 
 determination | Nullable Enum | Specifies the determination of the alert. Possible values are: 'NotAvailable', 'Apt', 'Malware', 'SecurityPersonnel', 'SecurityTesting', 'UnwantedSoftware', 'Other'.
-category| String | Category of the alert. The property values are: 'None', 'SuspiciousActivity', 'Malware', 'CredentialTheft', 'Exploit', 'WebExploit', 'DocumentExploit', 'PrivilegeEscalation', 'Persistence', 'RemoteAccessTool', 'CommandAndControl', 'SuspiciousNetworkTraffic', 'Ransomware', 'MalwareDownload', 'Reconnaissance', 'WebFingerprinting', 'Weaponization', 'Delivery', 'SocialEngineering', 'CredentialStealing', 'Installation', 'Backdoor', 'Trojan', 'TrojanDownloader', 'LateralMovement', 'ExplorationEnumeration', 'NetworkPropagation', 'Exfiltration', 'NotApplicable', 'EnterprisePolicy' and	'General' .
+category| String | Category of the alert. Possible values are: 'Collection', 'Command and control', 'Credential access', 'Defense evasion', 'Discovery', 'Execution', 'Exfiltration', 'Exploit', 'Initial access', 'Lateral movement', 'Malware', 'Persistence', 'Privilege escalation', 'Ransomware', 'Suspicious activity', 'Unwanted software'. 
 detectionSource | string | Detection source.
 threatFamilyName | string | Threat family.
 title | string | Alert title.