diff --git a/rtdata/languages/default b/rtdata/languages/default
index 2ff997c63..30fdd6ab9 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2051,6 +2051,7 @@ TP_LOCALLAB_SHAPETYPE;Shape RT-spot area
 TP_LOCALLAB_SHAPE_TOOLTIP;Rectangle is only in normal mode.
 TP_LOCALLAB_ELI;Elipse
 TP_LOCALLAB_RECT;Rectangle
+TP_LOCALLAB_SHADOWHIGHLIGHT_TOOLTIP;Can be used instead - or in complement - of exposure module in difficult cases
 TP_LOCALLAB_SHARP;Sharpening
 TP_LOCALLAB_SHARRADIUS;Radius
 TP_LOCALLAB_SHARAMOUNT;Amount
diff --git a/rtgui/locallab.cc b/rtgui/locallab.cc
index 1ae92c0c2..b4cb3a1de 100644
--- a/rtgui/locallab.cc
+++ b/rtgui/locallab.cc
@@ -511,6 +511,7 @@ Locallab::Locallab():
 //shadow highlight
     expshadhigh->signal_button_release_event().connect_notify(sigc::bind(sigc::mem_fun(this, &Locallab::foldAllButMe), expshadhigh));
     enableshadhighConn = expshadhigh->signal_enabled_toggled().connect(sigc::bind(sigc::mem_fun(this, &Locallab::enableToggled), expshadhigh));
+    expshadhigh->set_tooltip_text(M("TP_LOCALLAB_SHADOWHIGHLIGHT_TOOLTIP"));
 
     highlights->setAdjusterListener(this);
     h_tonalwidth->setAdjusterListener(this);