diff --git a/common/complete.c b/common/complete.c
index 9d749e0..d848396 100644
--- a/common/complete.c
+++ b/common/complete.c
@@ -20,13 +20,10 @@
 #include <common.h>
 #include <complete.h>
 #include <xfuncs.h>
-#include <linux/list.h>
-#include <malloc.h>
 #include <fs.h>
 #include <linux/stat.h>
 #include <libgen.h>
 #include <command.h>
-#include <stringlist.h>
 #include <environment.h>
 
 static int file_complete(struct string_list *sl, char *instr)
@@ -131,7 +128,7 @@
 	return 0;
 }
 
-static int command_complete(struct string_list *sl, char *instr)
+int command_complete(struct string_list *sl, char *instr)
 {
 	struct command *cmdtp;
 
@@ -236,6 +233,32 @@
 	tab_pressed = 0;
 }
 
+static char* cmd_complete_lookup(struct string_list *sl, char *instr)
+{
+	struct command *cmdtp;
+	int len;
+	int ret = 1;
+	char *res = NULL;
+
+	for_each_command(cmdtp) {
+		len = strlen(cmdtp->name);
+		if (!strncmp(instr, cmdtp->name, len) && instr[len] == ' ') {
+			instr += len + 1;
+			if (cmdtp->complete) {
+				ret = cmdtp->complete(sl, instr);
+				res = instr;
+			}
+			goto end;
+		}
+	}
+
+end:
+	if (ret == COMPLETE_CONTINUE && *instr == '$')
+		env_param_complete(sl, instr + 1, 1);
+
+	return res;
+}
+
 int complete(char *instr, char **outstr)
 {
 	struct string_list sl, *entry, *first_entry;
@@ -259,20 +282,22 @@
 	while (*t == ' ')
 		t++;
 
-	instr = t;
-
 	/* get the completion possibilities */
-	if ((t = strrchr(t, ' '))) {
-		t++;
-		file_complete(&sl, t);
+	instr = cmd_complete_lookup(&sl, t);
+	if (!instr) {
 		instr = t;
-	} else {
-		command_complete(&sl, instr);
-		path_command_complete(&sl, instr);
-		env_param_complete(&sl, instr, 0);
+		if ((t = strrchr(t, ' '))) {
+			t++;
+			file_complete(&sl, t);
+			instr = t;
+		} else {
+			command_complete(&sl, instr);
+			path_command_complete(&sl, instr);
+			env_param_complete(&sl, instr, 0);
+		}
+		if (*instr == '$')
+			env_param_complete(&sl, instr + 1, 1);
 	}
-	if (*instr == '$')
-		env_param_complete(&sl, instr + 1, 1);
 
 	pos = strlen(instr);
 
diff --git a/include/command.h b/include/command.h
index b2e8449..80cbf56 100644
--- a/include/command.h
+++ b/include/command.h
@@ -40,6 +40,8 @@
 
 #define for_each_command(cmd)	list_for_each_entry(cmd, &command_list, list)
 
+struct string_list;
+
 /*
  * Monitor Command Table
  */
@@ -48,6 +50,7 @@
 	const char	**aliases;
 					/* Implementation function	*/
 	int		(*cmd)(int, char *[]);
+	int		(*complete)(struct string_list *sl, char *instr);
 	const char	*usage;		/* Usage message	(short)	*/
 
 	struct list_head list;		/* List of commands		*/
@@ -88,6 +91,11 @@
 
 #define BAREBOX_CMD_END					\
 };
+#ifdef CONFIG_AUTO_COMPLETE
+#define BAREBOX_CMD_COMPLETE(_cpt) .complete = _cpt,
+#else
+#define BAREBOX_CMD_COMPLETE(_cpt)
+#endif
 
 #define BAREBOX_CMD_HELP_START(_name) \
 static const __maybe_unused char cmd_##_name##_help[] =
diff --git a/include/complete.h b/include/complete.h
index cc0e88d..0c8ebd6 100644
--- a/include/complete.h
+++ b/include/complete.h
@@ -2,9 +2,16 @@
 #define __COMPLETE_
 
 #include <linux/list.h>
+#include <malloc.h>
+#include <stringlist.h>
+
+#define COMPLETE_END		0
+#define COMPLETE_CONTINUE	1
 
 int complete(char *instr, char **outstr);
 void complete_reset(void);
 
+int command_complete(struct string_list *sl, char *instr);
+
 #endif /* __COMPLETE_ */