diff --git a/src/acl.c b/src/acl.c
index d01f2dc939..12c6d5ab02 100644
--- a/src/acl.c
+++ b/src/acl.c
@@ -2910,9 +2910,18 @@ void aclCommand(client *c) {
             }
         }
         raxStop(&ri);
-    } else if (!strcasecmp(sub, "whoami") && c->argc == 2) {
+    } else if (!strcasecmp(sub, "whoami") && (c->argc == 2 || c->argc == 3)) {
         if (c->user != NULL) {
-            addReplyBulkCBuffer(c, c->user->name, sdslen(c->user->name));
+            if (c->argc == 3) {
+                sds config = sdsnew(c->user->name);
+                config = sdscatlen(config, " ", 1);
+                robj *descr = ACLDescribeUser(c->user);
+                config = sdscatsds(config, descr->ptr);
+                decrRefCount(descr);
+                addReplyBulkSds(c, config);
+            } else {
+                addReplyBulkCBuffer(c, c->user->name, sdslen(c->user->name));
+            }
         } else {
             addReplyNull(c);
         }
diff --git a/src/commands.def b/src/commands.def
index 613eb16c9b..1cf0e88269 100644
--- a/src/commands.def
+++ b/src/commands.def
@@ -6380,7 +6380,9 @@ struct COMMAND_ARG ACL_SETUSER_Args[] = {
 
 #ifndef SKIP_CMD_HISTORY_TABLE
 /* ACL WHOAMI history */
-#define ACL_WHOAMI_History NULL
+commandHistory ACL_WHOAMI_History[] = {
+{"9.0.0","Added the `FULL` option."},
+};
 #endif
 
 #ifndef SKIP_CMD_TIPS_TABLE
@@ -6393,6 +6395,11 @@ struct COMMAND_ARG ACL_SETUSER_Args[] = {
 #define ACL_WHOAMI_Keyspecs NULL
 #endif
 
+/* ACL WHOAMI argument table */
+struct COMMAND_ARG ACL_WHOAMI_Args[] = {
+{MAKE_ARG("full",ARG_TYPE_PURE_TOKEN,-1,"FULL",NULL,"9.0.0",CMD_ARG_OPTIONAL,0,NULL)},
+};
+
 /* ACL command table */
 struct COMMAND_STRUCT ACL_Subcommands[] = {
 {MAKE_CMD("cat","Lists the ACL categories, or the commands inside a category.","O(1) since the categories and commands are a fixed set.","6.0.0",CMD_DOC_NONE,NULL,NULL,"server",COMMAND_GROUP_SERVER,ACL_CAT_History,0,ACL_CAT_Tips,0,aclCommand,-2,CMD_NOSCRIPT|CMD_LOADING|CMD_STALE|CMD_SENTINEL,0,ACL_CAT_Keyspecs,0,NULL,1),.args=ACL_CAT_Args},
@@ -6407,7 +6414,7 @@ struct COMMAND_STRUCT ACL_Subcommands[] = {
 {MAKE_CMD("save","Saves the effective ACL rules in the configured ACL file.","O(N). Where N is the number of configured users.","6.0.0",CMD_DOC_NONE,NULL,NULL,"server",COMMAND_GROUP_SERVER,ACL_SAVE_History,0,ACL_SAVE_Tips,2,aclCommand,2,CMD_ADMIN|CMD_NOSCRIPT|CMD_LOADING|CMD_STALE|CMD_SENTINEL,0,ACL_SAVE_Keyspecs,0,NULL,0)},
 {MAKE_CMD("setuser","Creates and modifies an ACL user and its rules.","O(N). Where N is the number of rules provided.","6.0.0",CMD_DOC_NONE,NULL,NULL,"server",COMMAND_GROUP_SERVER,ACL_SETUSER_History,2,ACL_SETUSER_Tips,2,aclCommand,-3,CMD_ADMIN|CMD_NOSCRIPT|CMD_LOADING|CMD_STALE|CMD_SENTINEL,0,ACL_SETUSER_Keyspecs,0,NULL,2),.args=ACL_SETUSER_Args},
 {MAKE_CMD("users","Lists all ACL users.","O(N). Where N is the number of configured users.","6.0.0",CMD_DOC_NONE,NULL,NULL,"server",COMMAND_GROUP_SERVER,ACL_USERS_History,0,ACL_USERS_Tips,0,aclCommand,2,CMD_ADMIN|CMD_NOSCRIPT|CMD_LOADING|CMD_STALE|CMD_SENTINEL,0,ACL_USERS_Keyspecs,0,NULL,0)},
-{MAKE_CMD("whoami","Returns the authenticated username of the current connection.","O(1)","6.0.0",CMD_DOC_NONE,NULL,NULL,"server",COMMAND_GROUP_SERVER,ACL_WHOAMI_History,0,ACL_WHOAMI_Tips,0,aclCommand,2,CMD_NOSCRIPT|CMD_LOADING|CMD_STALE|CMD_SENTINEL,0,ACL_WHOAMI_Keyspecs,0,NULL,0)},
+{MAKE_CMD("whoami","Returns the authenticated username of the current connection or its effective rules in ACL file format.","O(1)","6.0.0",CMD_DOC_NONE,NULL,NULL,"server",COMMAND_GROUP_SERVER,ACL_WHOAMI_History,1,ACL_WHOAMI_Tips,0,aclCommand,-2,CMD_NOSCRIPT|CMD_LOADING|CMD_STALE|CMD_SENTINEL,0,ACL_WHOAMI_Keyspecs,0,NULL,1),.args=ACL_WHOAMI_Args},
 {0}
 };
 
diff --git a/src/commands/acl-whoami.json b/src/commands/acl-whoami.json
index 2efe98c52f..cf760697ad 100644
--- a/src/commands/acl-whoami.json
+++ b/src/commands/acl-whoami.json
@@ -1,12 +1,18 @@
 {
     "WHOAMI": {
-        "summary": "Returns the authenticated username of the current connection.",
+        "summary": "Returns the authenticated username of the current connection or its effective rules in ACL file format.",
         "complexity": "O(1)",
         "group": "server",
         "since": "6.0.0",
-        "arity": 2,
+        "arity": -2,
         "container": "ACL",
         "function": "aclCommand",
+        "history": [
+            [
+                "9.0.0",
+                "Added the `FULL` option."
+            ]
+        ],
         "command_flags": [
             "NOSCRIPT",
             "LOADING",
@@ -16,6 +22,16 @@
         "reply_schema": {
             "type": "string",
             "description": "The username of the current connection."
-        }
+        },
+        "arguments": [
+            {
+                "name": "full",
+                "type": "pure-token",
+                "token": "FULL",
+                "optional": true,
+                "since": "9.0.0"
+            }
+        ]
+
     }
 }
diff --git a/tests/unit/acl.tcl b/tests/unit/acl.tcl
index 6c2b653540..0113d7dd18 100644
--- a/tests/unit/acl.tcl
+++ b/tests/unit/acl.tcl
@@ -3,6 +3,10 @@ start_server {tags {"acl external:skip"}} {
         r ACL WHOAMI
     } {default}
 
+    test {Connections with the effective ACL rules of the default user} {
+        r ACL WHOAMI FULL
+    } {*default on nopass*}
+
     test {It is possible to create new users} {
         r ACL setuser newuser
     }