diff --git a/rtdata/languages/default b/rtdata/languages/default
index 99768a559..7a3e5d9c6 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2729,7 +2729,8 @@ TP_LOCALLAB_SOFTRADIUSCOL;Soft radius
 TP_LOCALLAB_SOFTRETI;Reduce artifact ΔE
 TP_LOCALLAB_SOFTRETI_TOOLTIP;Take into account deltaE to improve Transmission map
 TP_LOCALLAB_SOURCE_GRAY;Value
-TP_LOCALLAB_SPECIAL;Special use of RGB curves 
+TP_LOCALLAB_SPECIAL;Special use of RGB curves
+TP_LOCALLAB_SPECIAL_TOOLTIP;Only for this RGB curve, disabled (or reduce effects) of Scope, mask...for example, if you want to have a negative effect.
 TP_LOCALLAB_SPOTNAME;Control Spot #
 TP_LOCALLAB_STD;Standard
 TP_LOCALLAB_STR;Strength
diff --git a/rtgui/locallabtools.cc b/rtgui/locallabtools.cc
index 46fa4f052..4f781bde9 100644
--- a/rtgui/locallabtools.cc
+++ b/rtgui/locallabtools.cc
@@ -901,6 +901,7 @@ void LocallabColor::updateAdviceTooltips(const bool showTooltips)
         maskHCurveEditorG->set_tooltip_text(M("TP_LOCALLAB_HHMASK_TOOLTIP"));
         mask2CurveEditorGwav->set_tooltip_text(M("TP_LOCALLAB_WAVMASK_TOOLTIP"));
         mask2CurveEditorG->set_tooltip_text(M("TP_LOCALLAB_CONTRASTCURVMASK_TOOLTIP"));
+        special->set_tooltip_text(M("TP_LOCALLAB_SPECIAL_TOOLTIP"));
         } else {
         exp->set_tooltip_text("");
         lightness->set_tooltip_text("");
@@ -928,6 +929,7 @@ void LocallabColor::updateAdviceTooltips(const bool showTooltips)
         maskHCurveEditorG->set_tooltip_text(M(""));
         mask2CurveEditorGwav->set_tooltip_text(M(""));
         mask2CurveEditorG->set_tooltip_text(M(""));
+        special->set_tooltip_text(M(""));
     }
 }