diff --git a/rtdata/languages/default b/rtdata/languages/default
index 6f554ed0e..b4be3d37f 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2589,6 +2589,7 @@ TP_LOCALLAB_MRFOU;Previous Spot
 TP_LOCALLAB_MRONE;None
 TP_LOCALLAB_MRTHR;Original Image
 TP_LOCALLAB_MRTWO;Short Curves 'L' Mask
+TP_LOCALLAB_MULTIPL_TOOLTIP;Allows the retouching of tones over a very wide range : -18EV +4EV. The first slider acts on very dark tones between -18EV and -6EV. The last slider acts light tones up to 4EV  
 TP_LOCALLAB_NEIGH;Radius
 TP_LOCALLAB_NOISECHROCOARSE;Chroma coarse (Wav)
 TP_LOCALLAB_NOISECHROC_TOOLTIP;If superior to zero, high quality algorithm is enabled.\nCoarse is for slider >=0.02
@@ -2708,6 +2709,7 @@ TP_LOCALLAB_SHOWSTRUCEX;Show structure Spot - disabled in "normal"
 TP_LOCALLAB_SHOWT;Mask and modifications
 TP_LOCALLAB_SHOWVI;Mask and modifications
 TP_LOCALLAB_SHRESFRA;Shadows/Highlights
+TP_LOCALLAB_SHTRC_TOOLTIP;Modifies the tones of the image by acting on a TRC (Tone Response Curve).\nGamma acts mainly on light tones.\nSlope acts mainly on dark tones
 TP_LOCALLAB_SIGMAWAV;Damper
 TP_LOCALLAB_SIM;Simple
 TP_LOCALLAB_SLOMASKCOL;Slope mask
diff --git a/rtgui/locallabtools.cc b/rtgui/locallabtools.cc
index 1164151bc..4d6d2ff1d 100644
--- a/rtgui/locallabtools.cc
+++ b/rtgui/locallabtools.cc
@@ -3473,6 +3473,11 @@ void LocallabShadow::updateAdviceTooltips(const bool showTooltips)
         radmaskSH->set_tooltip_text(M("TP_LOCALLAB_LAPRAD_TOOLTIP"));
         lapmaskSH->set_tooltip_text(M("TP_LOCALLAB_LAPRAD_TOOLTIP"));
         LmaskSHshape->setTooltip(M("TP_LOCALLAB_LMASK_LL_TOOLTIP"));
+        for (unsigned int i = 0; i < multipliersh.size(); i++) {
+            multipliersh[i]->set_tooltip_text(M("TP_LOCALLAB_MULTIPL_TOOLTIP"));
+        }
+        gamSH->set_tooltip_text(M("TP_LOCALLAB_SHTRC_TOOLTIP"));
+        sloSH->set_tooltip_text(M("TP_LOCALLAB_SHTRC_TOOLTIP"));
     } else {
         exp->set_tooltip_text("");
         strSH->set_tooltip_text("");
@@ -3483,6 +3488,11 @@ void LocallabShadow::updateAdviceTooltips(const bool showTooltips)
         radmaskSH->set_tooltip_text("");
         lapmaskSH->set_tooltip_text("");
         LmaskSHshape->setTooltip("");
+        for (unsigned int i = 0; i < multipliersh.size(); i++) {
+            multipliersh[i]->set_tooltip_text(M(""));
+        }
+        gamSH->set_tooltip_text(M(""));
+        sloSH->set_tooltip_text(M(""));
     }
 }