Index: trunk/src/layer_grp.c
===================================================================
--- trunk/src/layer_grp.c	(revision 8641)
+++ trunk/src/layer_grp.c	(revision 8642)
@@ -594,6 +594,24 @@
 /*	NEWG(g, PCB_LYT_INTERN | PCB_LYT_OUTLINE, "outline");*/
 }
 
+
+
+int pcb_layergrp_rename_(pcb_layer_group_t *grp, char *name)
+{
+	free(grp->name);
+	grp->name = name;
+	pcb_event(PCB_EVENT_LAYERS_CHANGED, NULL);
+	return 0;
+}
+
+int pcb_layergrp_rename(pcb_board_t *pcb, pcb_layergrp_id_t gid, const char *name)
+{
+	pcb_layer_group_t *grp = pcb_get_layergrp(pcb, gid);
+	if (grp == NULL) return -1;
+	return pcb_layergrp_rename_(grp, pcb_strdup(name));
+}
+
+
 static pcb_layergrp_id_t pcb_layergrp_get_cached(pcb_board_t *pcb, pcb_layer_id_t *cache, unsigned int loc, unsigned int typ)
 {
 	pcb_layer_group_t *g;
Index: trunk/src/layer_grp.h
===================================================================
--- trunk/src/layer_grp.h	(revision 8641)
+++ trunk/src/layer_grp.h	(revision 8642)
@@ -108,6 +108,13 @@
 void pcb_layergrp_inhibit_inc(void);
 void pcb_layergrp_inhibit_dec(void);
 
+/* Rename an existing layer by idx */
+int pcb_layergrp_rename(pcb_board_t *pcb, pcb_layergrp_id_t gid, const char *lname);
+
+/* changes the name of a layer; memory has to be already allocated */
+int pcb_layergrp_rename_(pcb_layer_group_t *grp, char *name);
+
+
 /********* OBSOLETE functions, do not use in new code *********/
 /* parses the group definition string which is a colon separated list of
    comma separated layer numbers (1,2,b:4,6,8,t); oldfmt is 0 or 1