diff --git a/src/depot_cmd.cpp b/src/depot_cmd.cpp
--- a/src/depot_cmd.cpp
+++ b/src/depot_cmd.cpp
@@ -21,7 +21,11 @@
 
 #include "table/strings.h"
 
-
+/**
+ * Check whether the given name is globally unique amongst depots.
+ * @param name The name to check.
+ * @return True if there is no depot with the given name.
+ */
 static bool IsUniqueDepotName(const char *name)
 {
 	const Depot *d;