diff --git a/src/acl.c b/src/acl.c
index e4122fd2..407d8673 100644
--- a/src/acl.c
+++ b/src/acl.c
@@ -1446,7 +1446,7 @@ void aclCommand(client *c) {
     } else if (!strcasecmp(sub,"cat") && c->argc == 3) {
         uint64_t cflag = ACLGetCommandCategoryFlagByName(c->argv[2]->ptr);
         if (cflag == 0) {
-            addReplyErrorFormat(c, "Unknown category '%s'", c->argv[2]->ptr);
+            addReplyErrorFormat(c, "Unknown category '%s'", (char*)c->argv[2]->ptr);
             return;
         }
         int arraylen = 0;
@@ -1480,3 +1480,15 @@ NULL
         addReplySubcommandSyntaxError(c);
     }
 }
+
+void addReplyCommandCategories(client *c, struct redisCommand *cmd) {
+    int flagcount = 0;
+    void *flaglen = addReplyDeferredLen(c);
+    for (int j = 0; ACLCommandCategories[j].flag != 0; j++) {
+        if (cmd->flags & ACLCommandCategories[j].flag) {
+            addReplyStatusFormat(c, "@%s", ACLCommandCategories[j].name);
+            flagcount++;
+        }
+    }
+    setDeferredSetLen(c, flaglen, flagcount);
+}
diff --git a/src/server.c b/src/server.c
index 4adc7b67..89e79504 100644
--- a/src/server.c
+++ b/src/server.c
@@ -3698,8 +3698,8 @@ void addReplyCommand(client *c, struct redisCommand *cmd) {
     if (!cmd) {
         addReplyNull(c);
     } else {
-        /* We are adding: command name, arg count, flags, first, last, offset */
-        addReplyArrayLen(c, 6);
+        /* We are adding: command name, arg count, flags, first, last, offset, categories */
+        addReplyArrayLen(c, 7);
         addReplyBulkCString(c, cmd->name);
         addReplyLongLong(c, cmd->arity);
 
@@ -3729,6 +3729,8 @@ void addReplyCommand(client *c, struct redisCommand *cmd) {
         addReplyLongLong(c, cmd->firstkey);
         addReplyLongLong(c, cmd->lastkey);
         addReplyLongLong(c, cmd->keystep);
+
+        addReplyCommandCategories(c,cmd);
     }
 }
 
diff --git a/src/server.h b/src/server.h
index a396e1cf..99495265 100644
--- a/src/server.h
+++ b/src/server.h
@@ -1748,6 +1748,7 @@ char *ACLSetUserStringError(void);
 int ACLLoadConfiguredUsers(void);
 sds ACLDescribeUser(user *u);
 void ACLLoadUsersAtStartup(void);
+void addReplyCommandCategories(client *c, struct redisCommand *cmd);
 
 /* Sorted sets data type */