diff --git a/gnoemoe/gm-options.h b/gnoemoe/gm-options.h
index 14c9fbc..349d25d 100644
--- a/gnoemoe/gm-options.h
+++ b/gnoemoe/gm-options.h
@@ -47,22 +47,22 @@ struct _GmOptionsClass {
 	GObjectClass parent_class;
 
 	/* Signals */
-	void (* option_changed) (GmOptions *options, const gchar *key);
+	void (* option_changed) (GmOptions *options, gchar const *key);
 };
 
 GType gm_options_get_type(void) G_GNUC_CONST;
 GmOptions *gm_options_new(void);
 
 GmOptions *gm_options_dup(GmOptions *source);
-void gm_options_add(GmOptions *options, const gchar *key, const gchar *value);
-void gm_options_set(GmOptions *options, const gchar *key, const gchar *value);
-const gchar *gm_options_get(GmOptions *options, const gchar *key);
-void gm_options_set_int(GmOptions *options, const gchar *key, int value);
-int gm_options_get_int(GmOptions *options, const gchar *key);
+void gm_options_set(GmOptions *options, gchar const *key, gchar const *value);
+gchar const *gm_options_get(GmOptions *options, gchar const *key);
+void gm_options_set_int(GmOptions *options, gchar const *key, int value);
+int gm_options_get_int(GmOptions *options, gchar const *key);
+void gm_options_remove(GmOptions *options, gchar const *key);
 
 void gm_options_save(GmOptions *options);
-void gm_options_save_as(GmOptions *options, const gchar *filename);
-void gm_options_load(GmOptions *options, const gchar *filename);
+void gm_options_save_as(GmOptions *options, gchar const *filename);
+void gm_options_load(GmOptions *options, gchar const *filename);
 
 G_END_DECLS