diff --git a/rtdata/languages/default b/rtdata/languages/default
index b3e04635b..e206e82f7 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2813,7 +2813,7 @@ TP_LOCALLAB_SHOWSTRUCEX;Show spot structure(advanced)
 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_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.\nIt is recommended that the TRC of both devices (monitor and output profile) be sRGB (default).
 TP_LOCALLAB_SH_TOOLNAME;Shadows/Highlights & Tone Equalizer - 5
 TP_LOCALLAB_SIGMAWAV;Attenuation response
 TP_LOCALLAB_SIM;Simple
diff --git a/rtgui/locallabtools.cc b/rtgui/locallabtools.cc
index 09d1a7cf5..3fb654245 100644
--- a/rtgui/locallabtools.cc
+++ b/rtgui/locallabtools.cc
@@ -3557,7 +3557,7 @@ LocallabShadow::LocallabShadow():
     blurSHde(Gtk::manage(new Adjuster(M("TP_LOCALLAB_BLURDE"), 2, 100, 1, 5))),
     gamFrame(Gtk::manage(new Gtk::Frame(M("TP_LOCALLAB_GAMFRA")))),
     gamSH(Gtk::manage(new Adjuster(M("TP_LOCALLAB_GAMSH"), 0.25, 15.0, 0.01, 2.4))),
-    sloSH(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SLOSH"), 0.0, 150.0, 0.01, 12.92))),
+    sloSH(Gtk::manage(new Adjuster(M("TP_LOCALLAB_SLOSH"), 0.0, 300.0, 0.01, 12.92))),
     expgradsh(Gtk::manage(new MyExpander(false, M("TP_LOCALLAB_EXPGRAD")))),
     strSH(Gtk::manage(new Adjuster(M("TP_LOCALLAB_GRADSTR"), -4., 4., 0.05, 0.))),
     angSH(Gtk::manage(new Adjuster(M("TP_LOCALLAB_GRADANG"), -180, 180, 0.1, 0.))),