diff --git a/eeshow/git-hist.c b/eeshow/git-hist.c
index 441a15d..1b6d3e1 100644
--- a/eeshow/git-hist.c
+++ b/eeshow/git-hist.c
@@ -13,10 +13,12 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <time.h>	/* for vcs_long_for_pango */
 #include <alloca.h>
 
 #include "util.h"
 #include "main.h"
+#include "fmt-pango.h"	/* for vcs_long_for_pango */
 #include "git-util.h"
 #include "git-file.h"
 #include "git-hist.h"
@@ -213,6 +215,37 @@ const char *vcs_git_summary(struct hist *h)
 }
 
 
+/*
+ * @@@ This one is a bit inconvenient. It depends both on the information the
+ * VCS provides, some of which is fairly generic, but some may not be, and
+ * the very specific constraints imposed by the markup format of Pango. 
+ */
+
+char *vcs_git_long_for_pango(struct hist *h)
+{
+	const git_error *e;
+	git_buf buf = { 0 };
+	time_t commit_time;
+	const git_signature *sig;
+	char *s;
+
+	if (git_object_short_id(&buf, (git_object *) h->commit))
+		goto fail;
+	commit_time = git_commit_time(h->commit);
+	sig = git_commit_committer(h->commit);
+	s = fmt_pango("<b>%s</b> %s%s &lt;%s&gt;<small>\n%s</small>",
+	    buf.ptr, ctime(&commit_time), sig->name, sig->email,
+	    git_commit_summary(h->commit));
+	git_buf_free(&buf);
+	return s;
+
+fail:
+	e = giterr_last();
+	fprintf(stderr, "vcs_git_long_for_pango: %s\n", e->message);
+	exit(1);
+}
+
+
 void hist_iterate(struct hist *h,
     void (*fn)(void *user, struct hist *h), void *user)
 {
diff --git a/eeshow/git-hist.h b/eeshow/git-hist.h
index 2f89ec5..8caebfc 100644
--- a/eeshow/git-hist.h
+++ b/eeshow/git-hist.h
@@ -35,6 +35,7 @@ bool vcs_git_try(const char *path);
 struct hist *vcs_git_hist(const char *path);
 char *vcs_git_get_rev(struct hist *h);
 const char *vcs_git_summary(struct hist *hist);
+char *vcs_git_long_for_pango(struct hist *hist);
 void hist_iterate(struct hist *h, 
     void (*fn)(void *user, struct hist *h), void *user);
 void dump_hist(struct hist *h);
diff --git a/eeshow/gui-aoi.c b/eeshow/gui-aoi.c
index f44db30..6d8215a 100644
--- a/eeshow/gui-aoi.c
+++ b/eeshow/gui-aoi.c
@@ -26,12 +26,12 @@
 static const struct aoi *hovering = NULL;
 
 
-const struct aoi *aoi_add(struct aoi **aois, const struct aoi *aoi)
+struct aoi *aoi_add(struct aoi **aois, const struct aoi *cfg)
 {
 	struct aoi *new;
 
 	new = alloc_type(struct aoi);
-	*new = *aoi;
+	*new = *cfg;
 	new->next = *aois;
 	*aois = new;
 
@@ -39,6 +39,15 @@ const struct aoi *aoi_add(struct aoi **aois, const struct aoi *aoi)
 }
 
 
+void aoi_update(struct aoi *aoi, const struct aoi *cfg)
+{
+	struct aoi *next = aoi->next;
+
+	*aoi = *cfg;
+	aoi->next = next;
+}
+
+
 bool aoi_hover(const struct aoi *aois, int x, int y)
 {
 	const struct aoi *aoi;
@@ -85,8 +94,10 @@ bool aoi_click(const struct aoi *aois, int x, int y)
 
 void aoi_remove(struct aoi **aois, const struct aoi *aoi)
 {
-	if (hovering == aoi)
+	if (hovering == aoi) {
 		aoi->hover(aoi->user, 0);
+		hovering = NULL;
+	}
 	while (*aois != aoi)
 		aois = &(*aois)->next;
 	*aois = aoi->next;
diff --git a/eeshow/gui-aoi.h b/eeshow/gui-aoi.h
index 83e5719..59a4aa3 100644
--- a/eeshow/gui-aoi.h
+++ b/eeshow/gui-aoi.h
@@ -28,7 +28,8 @@ struct aoi {
 };
 
 
-const struct aoi *aoi_add(struct aoi **aois, const struct aoi *aoi);
+struct aoi *aoi_add(struct aoi **aois, const struct aoi *cfg);
+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);
diff --git a/eeshow/gui-over.c b/eeshow/gui-over.c
index de664dc..7641af5 100644
--- a/eeshow/gui-over.c
+++ b/eeshow/gui-over.c
@@ -50,7 +50,7 @@ struct overlay {
 	void (*click)(void *user);
 	void *user;
 
-	const struct aoi *aoi;
+	struct aoi *aoi;
 
 	struct overlay *next;
 };
@@ -179,7 +179,7 @@ fprintf(stderr, "%u(%d) %u %.60s\n", ty, ink_rect.y / PANGO_SCALE, ink_h, over->
 	g_object_unref(layout);
 
 	if (over->hover || over->click) {
-		struct aoi aoi = {
+		struct aoi aoi_cfg = {
 			.x	= *x,
 			.y	= *y,
 			.w	= w,
@@ -190,8 +190,9 @@ fprintf(stderr, "%u(%d) %u %.60s\n", ty, ink_rect.y / PANGO_SCALE, ink_h, over->
 		};
 
 		if (over->aoi)
-			aoi_remove(over->aois, over->aoi);
-		over->aoi = aoi_add(over->aois, &aoi);
+			aoi_update(over->aoi, &aoi_cfg);
+		else
+			over->aoi = aoi_add(over->aois, &aoi_cfg);
 	}
 
 	*y += h + style->skip;
@@ -241,13 +242,19 @@ void overlay_style(struct overlay *over, const struct overlay_style *style)
 }
 
 
+void overlay_text_raw(struct overlay *over, const char *s)
+{
+	free((char *) over->s);
+	over->s = stralloc(s);
+}
+
+
 void overlay_text(struct overlay *over, const char *fmt, ...)
 {
 	va_list ap;
 
-	free((char *) over->s);
 	va_start(ap, fmt);
-	over->s = vfmt_pango(fmt, ap);
+	overlay_text_raw(over, vfmt_pango(fmt, ap));
 	va_end(ap);
 }
 
diff --git a/eeshow/gui-over.h b/eeshow/gui-over.h
index e9e760d..42534cc 100644
--- a/eeshow/gui-over.h
+++ b/eeshow/gui-over.h
@@ -44,6 +44,7 @@ struct overlay *overlay_draw(struct overlay *over, cairo_t *cr, int *x, int *y);
 void overlay_draw_all(struct overlay *overlays, cairo_t *cr);
 struct overlay *overlay_add(struct overlay **overlays, struct aoi **aois,
     bool (*hover)(void *user, bool on), void (*click)(void *user), void *user);
+void overlay_text_raw(struct overlay *over, const char *s);
 void overlay_text(struct overlay *over, const char *fmt, ...);
 void overlay_style(struct overlay *over, const struct overlay_style *style);
 void overlay_remove(struct overlay **overlays, struct overlay *over);
diff --git a/eeshow/gui.c b/eeshow/gui.c
index 7a7532b..3d50f23 100644
--- a/eeshow/gui.c
+++ b/eeshow/gui.c
@@ -56,6 +56,7 @@ struct gui_sheet {
 struct gui_hist {
 	struct gui_ctx *ctx;		/* back link */
 	struct hist *hist;
+	struct overlay *over;		/* current overlay */
 	struct gui_sheet *sheets;	/* NULL if failed */
 	struct gui_hist *next;
 };
@@ -337,7 +338,8 @@ static void show_history(struct gui_ctx *ctx)
 
 static void show_history_cb(void *user)
 {
-	struct gui_ctx *ctx = user;
+	struct gui_hist *h = user;
+	struct gui_ctx *ctx = h->ctx;
 
 	show_history(ctx);
 }
@@ -358,6 +360,25 @@ static void close_subsheet(void *user)
 }
 
 
+static bool show_history_details(void *user, bool on)
+{
+	struct gui_hist *h = user;
+	struct gui_ctx *ctx = h->ctx;
+
+	char *s;
+
+	if (on) {
+		s = vcs_git_long_for_pango(h->hist);
+		overlay_text_raw(h->over, s);
+		free(s);
+	} else {
+		overlay_text(h->over, "%.40s", vcs_git_summary(h->hist));
+	}
+	redraw(ctx);
+	return 1;
+}
+
+
 static void go_to_sheet(struct gui_ctx *ctx, struct gui_sheet *sheet)
 {
 	struct overlay *over;
@@ -368,11 +389,11 @@ static void go_to_sheet(struct gui_ctx *ctx, struct gui_sheet *sheet)
 	}
 	ctx->curr_sheet = sheet;
 	overlay_remove_all(&ctx->sheet_overlays);
-	if (ctx->hist) {
-		over = overlay_add(&ctx->sheet_overlays, &ctx->aois,
-		    NULL, show_history_cb, ctx);
-		overlay_text(over, "%.40s",
-		    vcs_git_summary(ctx->curr_hist->hist));
+	if (ctx->curr_hist) {
+		ctx->curr_hist->over = overlay_add(&ctx->sheet_overlays,
+		    &ctx->aois, show_history_details, show_history_cb,
+		    ctx->curr_hist);
+		show_history_details(ctx->curr_hist, 0);
 	}
 	if (sheet->sch->title) {
 		over = overlay_add(&ctx->sheet_overlays, &ctx->aois,
@@ -436,7 +457,9 @@ static gboolean motion_notify_event(GtkWidget *widget, GdkEventMotion *event,
 
 	canvas_coord(ctx, event->x, event->y, &x, &y);
 
-	aoi_hover(curr_sheet->aois, x + curr_sheet->xmin, y + curr_sheet->ymin);
+	aoi_hover(ctx->aois, event->x, event->y) ||
+	    aoi_hover(curr_sheet->aois,
+	    x + curr_sheet->xmin, y + curr_sheet->ymin);
 	pan_update(ctx, event->x, event->y);
 
 	return TRUE;