diff --git a/eeshow/dwg.c b/eeshow/dwg.c
index 08fa64a..f919ae1 100644
--- a/eeshow/dwg.c
+++ b/eeshow/dwg.c
@@ -25,6 +25,32 @@
 #include "dwg.h"
 
 
+/* ----- Helper functions -------------------------------------------------- */
+
+
+static void bbox_from_poly(struct dwg_bbox *bbox, unsigned n,
+    const int *vx, const int *vy)
+{
+	unsigned i;
+	int xmax, ymax;
+
+	bbox->x = xmax = *vx;
+	bbox->y = ymax = *vy;
+	for (i = 1; i != n; i++) {
+		if (vx[i] < bbox->x)
+			bbox->x = vx[i];
+		if (vy[i] < bbox->y)
+			bbox->y = vy[i];
+		if (vx[i] > xmax)
+			xmax = vx[i];
+		if (vy[i] > ymax)
+			ymax = vy[i];
+	}
+	bbox->w = xmax - bbox->x + 1;
+	bbox->h = ymax - bbox->y + 1;
+}
+
+
 /* ----- Labels ------------------------------------------------------------ */
 
 
@@ -54,7 +80,7 @@ static enum box_type flip_box(enum box_type box)
 
 
 void dwg_label(int x, int y, const char *s, int dir, int dim,
-    enum dwg_shape shape)
+    enum dwg_shape shape, struct dwg_bbox *bbox)
 {
 	struct text txt = {
 		.s = s,
@@ -99,7 +125,7 @@ void dwg_label(int x, int y, const char *s, int dir, int dim,
 
 
 void dwg_glabel(int x, int y, const char *s, int dir, int dim,
-    enum dwg_shape shape)
+    enum dwg_shape shape, struct dwg_bbox *bbox)
 {
 	struct text txt = {
 		.s = s,
@@ -235,6 +261,9 @@ void dwg_glabel(int x, int y, const char *s, int dir, int dim,
 	vy[0] = vy[n - 1];
 	gfx_poly(n, vx, vy, COLOR_GLABEL, COLOR_NONE, LAYER_GLABEL);
 
+	if (bbox)
+		bbox_from_poly(bbox, n, vx, vy);
+
 	if (asprintf(&tag, "G:%s", s)) {}
 	gfx_tag(tag, n, vx, vy);
 }
@@ -296,7 +325,7 @@ static int make_box(enum box_type box, int h, int *vx, int *vy)
 
 
 void dwg_hlabel(int x, int y, const char *s, int dir, int dim,
-    enum dwg_shape shape)
+    enum dwg_shape shape, struct dwg_bbox *bbox)
 {
 	struct text txt = {
 		.s = s,
@@ -374,7 +403,7 @@ void dwg_hlabel(int x, int y, const char *s, int dir, int dim,
 
 
 void dwg_text(int x, int y, const char *s, int dir, int dim,
-    enum dwg_shape shape)
+    enum dwg_shape shape, struct dwg_bbox *bbox)
 {
 	struct text txt = {
 		.s = s,
diff --git a/eeshow/dwg.h b/eeshow/dwg.h
index 697f524..725da8b 100644
--- a/eeshow/dwg.h
+++ b/eeshow/dwg.h
@@ -25,15 +25,20 @@ enum dwg_shape {
 	dwg_bidir,	// Bidirectional
 };
 
+struct dwg_bbox {
+	int x, y;
+	int w, h;
+};
+
 
 void dwg_label(int x, int y, const char *s, int dir, int dim,
-    enum dwg_shape shape);
+    enum dwg_shape shape, struct dwg_bbox *bbox);
 void dwg_hlabel(int x, int y, const char *s, int dir, int dim,
-    enum dwg_shape shape);
+    enum dwg_shape shape, struct dwg_bbox *bbox);
 void dwg_glabel(int x, int y, const char *s, int dir, int dim,
-    enum dwg_shape shape);
+    enum dwg_shape shape, struct dwg_bbox *bbox);
 void dwg_text(int x, int y, const char *s, int dir, int dim,
-    enum dwg_shape shape);
+    enum dwg_shape shape, struct dwg_bbox *bbox);
 
 void dwg_junction(int x, int y);
 void dwg_noconn(int x, int y);
diff --git a/eeshow/gui-aoi.c b/eeshow/gui-aoi.c
index 6d8215a..8bd9ec5 100644
--- a/eeshow/gui-aoi.c
+++ b/eeshow/gui-aoi.c
@@ -103,3 +103,12 @@ void aoi_remove(struct aoi **aois, const struct aoi *aoi)
 	*aois = aoi->next;
 	free((void *) aoi);
 }
+
+
+void aoi_dehover(void)
+{
+	if (hovering)
+		hovering->hover(hovering->user, 0);
+	hovering = NULL;
+}
+
diff --git a/eeshow/gui-aoi.h b/eeshow/gui-aoi.h
index 59a4aa3..f972c0f 100644
--- a/eeshow/gui-aoi.h
+++ b/eeshow/gui-aoi.h
@@ -33,5 +33,6 @@ void aoi_update(struct aoi *aoi, const struct aoi *cfg);
 bool aoi_hover(const struct aoi *aois, int x, int y);
 bool aoi_click(const struct aoi *aois, int x, int y);
 void aoi_remove(struct aoi **aois, const struct aoi *aoi);
+void aoi_dehover(void);
 
 #endif /* !GUI_AOI_H */
diff --git a/eeshow/gui.c b/eeshow/gui.c
index 09f76b7..0386633 100644
--- a/eeshow/gui.c
+++ b/eeshow/gui.c
@@ -35,6 +35,7 @@
 #include "sch.h"
 #include "delta.h"
 #include "diff.h"
+#include "dwg.h"
 #include "gui-aoi.h"
 #include "gui-style.h"
 #include "gui-over.h"
@@ -678,6 +679,7 @@ static void do_sheet_overlays(struct gui_ctx *ctx)
 
 static void go_to_sheet(struct gui_ctx *ctx, struct gui_sheet *sheet)
 {
+	aoi_dehover();
 	if (!sheet->rendered) {
 		render_sheet(sheet);
 		mark_aois(ctx, sheet);
@@ -906,6 +908,30 @@ static void select_subsheet(void *user)
 }
 
 
+struct glabel_aoi_ctx {
+	const struct gui_sheet *sheet;
+	const struct sch_obj *obj;
+	struct overlay *over;
+};
+
+
+static bool hover_glabel(void *user, bool on)
+{
+	struct glabel_aoi_ctx *aoi_ctx = user;
+	struct gui_ctx *ctx = aoi_ctx->sheet->ctx;
+
+	if (on) {
+		aoi_ctx->over = overlay_add(&ctx->sheet_overlays, NULL,// aois
+		    NULL, NULL, NULL);
+		overlay_text_raw(aoi_ctx->over, aoi_ctx->obj->u.text.s);
+	} else {
+		overlay_remove(&ctx->sheet_overlays, aoi_ctx->over);
+	}
+	redraw(ctx);
+	return 1;
+}
+
+
 /* ----- Initialization ---------------------------------------------------- */
 
 
@@ -930,6 +956,26 @@ static void add_sheet_aoi(struct gui_ctx *ctx, struct gui_sheet *parent,
 }
 
 
+static void add_glabel_aoi(struct gui_sheet *sheet, const struct sch_obj *obj)
+{
+	const struct dwg_bbox *bbox = &obj->u.text.bbox;
+	struct glabel_aoi_ctx *aoi_ctx = alloc_type(struct glabel_aoi_ctx);
+	struct aoi cfg = {
+		.x	= bbox->x,
+		.y	= bbox->y,
+		.w	= bbox->w,
+		.h	= bbox->h,
+		.hover	= hover_glabel,
+		.user	= aoi_ctx,
+	};
+
+	aoi_ctx->sheet = sheet;
+	aoi_ctx->obj = obj;
+
+	aoi_add(&sheet->aois, &cfg);
+}
+
+
 static void mark_aois(struct gui_ctx *ctx, struct gui_sheet *sheet)
 {
 	const struct sch_obj *obj;
@@ -940,6 +986,8 @@ static void mark_aois(struct gui_ctx *ctx, struct gui_sheet *sheet)
 		case sch_obj_sheet:
 			add_sheet_aoi(ctx, sheet, obj);
 			break;
+		case sch_obj_glabel:
+			add_glabel_aoi(sheet, obj);
 		default:
 			break;
 		}
diff --git a/eeshow/sch-render.c b/eeshow/sch-render.c
index f8920e1..9530c74 100644
--- a/eeshow/sch-render.c
+++ b/eeshow/sch-render.c
@@ -124,14 +124,14 @@ static void render_sheet(const struct sch_obj *obj,
 	for (field = sheet->fields; field; field = field->next)
 		dwg_hlabel(obj->x, obj->y, field->s,
 		    field->side, field->dim,
-		    field->shape);
+		    field->shape, NULL);
 	// free(field->s)
 }
 
 
 void sch_render(const struct sheet *sheet)
 {
-	const struct sch_obj *obj;
+	struct sch_obj *obj;
 
 	for (obj = sheet->objs; obj; obj = obj->next)
 		switch (obj->type) {
@@ -151,10 +151,10 @@ void sch_render(const struct sheet *sheet)
 		case sch_obj_glabel:
 		case sch_obj_text:
 			{
-				const struct sch_text *text = &obj->u.text;
+				struct sch_text *text = &obj->u.text;
 
 				text->fn(obj->x, obj->y, text->s, text->dir,
-				    text->dim, text->shape);
+				    text->dim, text->shape, &text->bbox);
 			}
 			break;
 		case sch_obj_comp:
diff --git a/eeshow/sch.h b/eeshow/sch.h
index 35b8af0..2c2434f 100644
--- a/eeshow/sch.h
+++ b/eeshow/sch.h
@@ -54,11 +54,13 @@ struct sch_obj {
 		} wire;
 		struct sch_text {
 			void (*fn)(int x, int y, const char *s,
-			    int dir, int dim, enum dwg_shape shape);
+			    int dir, int dim, enum dwg_shape shape,
+			    struct dwg_bbox *bbox);
 			const char *s;
 			int dir;	/* orientation */
 			int dim;	/* dimension */
 			enum dwg_shape shape;
+			struct dwg_bbox bbox; /* set when rendering; glabel */
 		} text;
 		struct sch_comp {
 			const struct comp *comp; /* current component */