diff --git a/rtdata/languages/default b/rtdata/languages/default
index acf03e48b..503600e28 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -1554,6 +1554,7 @@ TP_EXPOSURE_CURVEEDITOR2;Tone curve 2
 TP_EXPOSURE_CURVEEDITOR2_TOOLTIP;Please refer to the "Exposure > Tone Curves" RawPedia article to learn how to achieve the best results by using two tone curves.
 TP_EXPOSURE_EXPCOMP;Exposure compensation
 TP_EXPOSURE_HISTMATCHING;Auto-matched Tone Curve
+TP_EXPOSURE_HISTMATCHING_TOOLTIP;Automatically adjust sliders and curves (except exposure compensation) to match the look of the embedded JPEG thumbnail.
 TP_EXPOSURE_LABEL;Exposure
 TP_EXPOSURE_SATURATION;Saturation
 TP_EXPOSURE_TCMODE_FILMLIKE;Film-like
diff --git a/rtgui/tonecurve.cc b/rtgui/tonecurve.cc
index fd4c0827d..ce938178e 100644
--- a/rtgui/tonecurve.cc
+++ b/rtgui/tonecurve.cc
@@ -127,6 +127,7 @@ ToneCurve::ToneCurve () : FoldableToolPanel(this, "tonecurve", M("TP_EXPOSURE_LA
     pack_start (*Gtk::manage (new  Gtk::HSeparator()));
 
     histmatching = Gtk::manage(new Gtk::ToggleButton(M("TP_EXPOSURE_HISTMATCHING")));
+    histmatching->set_tooltip_markup(M("TP_EXPOSURE_HISTMATCHING_TOOLTIP"));
     histmatchconn = histmatching->signal_toggled().connect(sigc::mem_fun(*this, &ToneCurve::histmatchingToggled));
     pack_start(*histmatching, true, true, 2);
 
@@ -448,6 +449,7 @@ void ToneCurve::setRaw (bool raw)
     disableListener ();
     method->set_sensitive (raw);
     hrenabled->set_sensitive (raw);
+    histmatching->set_sensitive(raw);
     enableListener ();
 }