diff --git a/src/common/options.h b/src/common/options.h
--- a/src/common/options.h
+++ b/src/common/options.h
@@ -50,5 +50,8 @@ struct options_common
  */
 int options_init(int argc, char *argv[], cfg_t **mycfg, struct options_common **allopts);
 
+/**
+   Frees the struct options_common. This should be run before the program exits.
+ */
 int options_free(struct options_common *allopts);
 #endif