diff --git a/planner.c b/planner.c
index 768344caa..16152b195 100644
--- a/planner.c
+++ b/planner.c
@@ -638,7 +638,7 @@ static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive, bool
 	snprintf(temp, sizeof(temp), "%s", translate("gettextFromC", "Gas consumption:"));
 	len += snprintf(buffer + len, sizeof(buffer) - len, "</tbody></table></div><div><br>%s<br>", temp);
 	for (gasidx = 0; gasidx < MAX_CYLINDERS; gasidx++) {
-		double volume, deco_volume, deco_pressure;
+		double volume, pressure, deco_volume, deco_pressure;
 		const char *unit, *pressure_unit;
 		char warning[1000] = "";
 		cylinder_t *cyl = &dive->cylinder[gasidx];
@@ -649,6 +649,7 @@ static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive, bool
 		deco_volume = get_volume_units(cyl->deco_gas_used.mliter, NULL, &unit);
 		if (cyl->type.size.mliter) {
 			deco_pressure = get_pressure_units(1000.0 * cyl->deco_gas_used.mliter / cyl->type.size.mliter, &pressure_unit);
+			pressure = get_pressure_units(1000.0 * cyl->gas_used.mliter / cyl->type.size.mliter, &pressure_unit);
 			/* Warn if the plan uses more gas than is available in a cylinder
 			 * This only works if we have working pressure for the cylinder
 			 * 10bar is a made up number - but it seemed silly to pretend you could breathe cylinder down to 0 */
@@ -656,7 +657,13 @@ static void add_plan_to_notes(struct diveplan *diveplan, struct dive *dive, bool
 				snprintf(warning, sizeof(warning), " &mdash; <span style='color: red;'>%s </span> %s",
 					translate("gettextFromC", "Warning:"),
 					translate("gettextFromC", "this is more gas than available in the specified cylinder!"));
-			snprintf(temp, sizeof(temp), translate("gettextFromC", "%.0f%s (%.0f%s/%.0f%s in planned ascent) of %s"), volume, unit, deco_volume, unit, deco_pressure, pressure_unit, gasname(&cyl->gasmix));
+			else
+				if ((float) cyl->end.mbar * cyl->type.size.mliter / 1000.0 < (float) cyl->deco_gas_used.mliter)
+					snprintf(warning, sizeof(warning), " &mdash; <span style='color: red;'>%s </span> %s",
+						translate("gettextFromC", "Warning:"),
+						translate("gettextFromC", "not enough reserve for gas sharing on ascent!"));
+
+			snprintf(temp, sizeof(temp), translate("gettextFromC", "%.0f%s/%.0f%s of %s (%.0f%s/%.0f%s in planned ascent)"), volume, unit, pressure, pressure_unit, gasname(&cyl->gasmix), deco_volume, unit, deco_pressure, pressure_unit);
 		} else {
 			snprintf(temp, sizeof(temp), translate("gettextFromC", "%.0f%s (%.0f%s during planned ascent) of %s"), volume, unit, deco_volume, unit, gasname(&cyl->gasmix));
 		}