diff --git a/redismodule.h b/redismodule.h
index 7f2e448..cd73295 100644
--- a/redismodule.h
+++ b/redismodule.h
@@ -520,7 +520,8 @@ typedef void (*RedisModuleEventLoopOneShotFunc)(void *user_data);
 #define REDISMODULE_EVENT_KEY 17
 #define REDISMODULE_EVENT_CLUSTER_SLOT_MIGRATION 18
 #define REDISMODULE_EVENT_CLUSTER_SLOT_MIGRATION_TRIM 19
-#define _REDISMODULE_EVENT_NEXT 20 /* Next event flag, should be updated if a new event added. */
+#define REDISMODULE_EVENT_CLUSTER_TOPOLOGY_CHANGE 20
+#define _REDISMODULE_EVENT_NEXT 21 /* Next event flag, should be updated if a new event added. */
 
 typedef struct RedisModuleEvent {
     uint64_t id;        /* REDISMODULE_EVENT_... defines. */
@@ -639,6 +640,10 @@ static const RedisModuleEvent
     RedisModuleEvent_ClusterSlotMigrationTrim = {
         REDISMODULE_EVENT_CLUSTER_SLOT_MIGRATION_TRIM,
         1
+    },
+    RedisModuleEvent_ClusterTopologyChange = {
+        REDISMODULE_EVENT_CLUSTER_TOPOLOGY_CHANGE,
+        1
     };
 
 /* Those are values that are used for the 'subevent' callback argument. */
@@ -731,6 +736,9 @@ static const RedisModuleEvent
 #define REDISMODULE_SUBEVENT_CLUSTER_SLOT_MIGRATION_TRIM_BACKGROUND 2
 #define _REDISMODULE_SUBEVENT_CLUSTER_SLOT_MIGRATION_TRIM_NEXT 3
 
+/* RedisModuleEvent_ClusterTopologyChange has no meaningful subevent. */
+#define _REDISMODULE_SUBEVENT_CLUSTER_TOPOLOGY_CHANGE_NEXT 0
+
 /* RedisModuleClientInfo flags. */
 #define REDISMODULE_CLIENTINFO_FLAG_SSL (1<<0)
 #define REDISMODULE_CLIENTINFO_FLAG_PUBSUB (1<<1)
@@ -895,6 +903,26 @@ typedef struct RedisModuleClusterSlotMigrationTrimInfo {
 
 #define RedisModuleClusterSlotMigrationTrimInfo RedisModuleClusterSlotMigrationTrimInfoV1
 
+/* Reason flags reported in RedisModuleClusterTopologyChangeInfo.change_flags.
+ * More than one bit may be set when several changes were collapsed into a
+ * single (debounced) RedisModuleEvent_ClusterTopologyChange notification. */
+#define REDISMODULE_CLUSTER_TOPOLOGY_CHANGE_FLAG_SLOT  (1<<0) /* Slot ownership changed. */
+#define REDISMODULE_CLUSTER_TOPOLOGY_CHANGE_FLAG_ROLE  (1<<1) /* A node changed its primary/replica role. */
+#define REDISMODULE_CLUSTER_TOPOLOGY_CHANGE_FLAG_STATE (1<<2) /* The cluster OK/FAIL state changed. */
+#define REDISMODULE_CLUSTER_TOPOLOGY_CHANGE_FLAG_NODE  (1<<3) /* A node joined or left the cluster. */
+
+#define REDISMODULE_CLUSTER_TOPOLOGY_CHANGE_INFO_VERSION 1
+
+typedef struct RedisModuleClusterTopologyChangeInfo {
+    uint64_t version;       /* Not used since this structure is never passed
+                               from the module to the core right now. Here
+                               for future compatibility. */
+    uint64_t change_flags;  /* Bitmask of REDISMODULE_CLUSTER_TOPOLOGY_CHANGE_FLAG_*
+                               reasons that contributed to this notification. */
+} RedisModuleClusterTopologyChangeInfoV1;
+
+#define RedisModuleClusterTopologyChangeInfo RedisModuleClusterTopologyChangeInfoV1
+
 typedef enum {
     REDISMODULE_ACL_LOG_AUTH = 0, /* Authentication failure */
     REDISMODULE_ACL_LOG_CMD, /* Command authorization failure */