diff --git a/source/os/debug/include/list.h b/source/os/debug/include/list.h
index b87e3be..f26b4fe 100644
--- a/source/os/debug/include/list.h
+++ b/source/os/debug/include/list.h
@@ -20,5 +20,6 @@ struct list {
 
 int list_init(struct list *head);
 int list_add(struct list *head, struct list_node *node);
+int list_get_len(struct list *head);
 
 #endif /* SOURCE_FIRMWARE_KERNEL_LIST_H_ */
diff --git a/source/os/debug/include/shell.h b/source/os/debug/include/shell.h
index 81fd032..c242e8d 100644
--- a/source/os/debug/include/shell.h
+++ b/source/os/debug/include/shell.h
@@ -12,6 +12,7 @@ typedef void *(*command_callback)(const char*);
 
 struct command {
 	const char *command;
+	const char *description;
 	const command_callback command_callback;
 	struct list_node item;
 };
diff --git a/source/os/debug/libkosmos-arm-stm32f4-discovery-0.0.5-dbg.a b/source/os/debug/libkosmos-arm-stm32f4-discovery-0.0.5-dbg.a
new file mode 100644
index 0000000..3620324
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diff --git a/source/os/debug/libkosmos-arm-stm32f4-discovery-dbg.a b/source/os/debug/libkosmos-arm-stm32f4-discovery-dbg.a
deleted file mode 100644
index a8c73f0..0000000
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diff --git a/source/os/debug/libkosmos-arm-stm32f4-discovery-dbg.a b/source/os/debug/libkosmos-arm-stm32f4-discovery-dbg.a
new file mode 120000
index 0000000..84ac1a0
--- /dev/null
+++ b/source/os/debug/libkosmos-arm-stm32f4-discovery-dbg.a
@@ -0,0 +1 @@
+libkosmos-arm-stm32f4-discovery-0.0.5-dbg.a
\ No newline at end of file
diff --git a/source/os/release/libkosmos-arm-stm32f4-discovery-0.0.5.a b/source/os/release/libkosmos-arm-stm32f4-discovery-0.0.5.a
new file mode 100644
index 0000000..1f12c56
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diff --git a/source/os/release/libkosmos-arm-stm32f4-discovery.a b/source/os/release/libkosmos-arm-stm32f4-discovery.a
deleted file mode 100644
index a8ef8be..0000000
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diff --git a/source/os/release/libkosmos-arm-stm32f4-discovery.a b/source/os/release/libkosmos-arm-stm32f4-discovery.a
new file mode 120000
index 0000000..08e7161
--- /dev/null
+++ b/source/os/release/libkosmos-arm-stm32f4-discovery.a
@@ -0,0 +1 @@
+libkosmos-arm-stm32f4-discovery-0.0.5.a
\ No newline at end of file