diff --git a/rtdata/languages/default b/rtdata/languages/default
index 8f916549c..67c633452 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2498,10 +2498,11 @@ TP_LOCALLAB_LABGRIDMERG;Background
 TP_LOCALLAB_LABGRID_VALUES;High(a)=%1 High(b)=%2\nLow(a)=%3 Low(b)=%4
 TP_LOCALLAB_LABSTRUM;Mask Structure
 TP_LOCALLAB_LAPLACC;ΔØ Mask Laplacian solve PDE
+TP_LOCALLAB_LAP_MASK_TOOLTIP;Solve PDE equation for all Laplacian masks.\nIf enabled Laplacian threshold mask reduce artifacts and smooth result.\nIf disabled linear response. 
 TP_LOCALLAB_LAPLACE;Δ - Laplacian threshold ΔE
 TP_LOCALLAB_LAPLACEXP;∆ - Laplacian threshold
 TP_LOCALLAB_LAPMASKCOL;∆ - Laplacian threshold mask
-TP_LOCALLAB_LAPRAD_TOOLTIP;Avoid using Radius and Laplace Threshold simultaneously
+TP_LOCALLAB_LAPRAD_TOOLTIP;Avoid using Radius and Laplace Threshold simultaneously.\nLaplacian threshold reduce contrast, artifacts, smooth result (if PDE settings enabled).
 TP_LOCALLAB_LC_FFTW_TOOLTIP;FFT improve quality and allow big radius, but increases the treatment time.\nThe treatment time depends on the surface to be treated.\nTo be used preferably for large radius.\n\nDimensions can be reduced by a few pixels to optimize FFTW.\nThis optimization can reduce the treatment time by a factor of 1.5 to 10.\n
 TP_LOCALLAB_LEVELBLUR;Maximum Blur levels
 TP_LOCALLAB_LEVELLOCCONTRAST_TOOLTIP;On the abscissa local contrast (near concept luminance). On the ordinate, amplification or reduction local contrast.
@@ -2679,7 +2680,7 @@ TP_LOCALLAB_SHADHIGH;Shadows Highlight - Tone equalizer
 TP_LOCALLAB_SHADOWHIGHLIGHT_TOOLTIP;Can be used instead - or in complement - of exposure module in difficult cases.\nThe use of Denoise may be necessary : lightening the shadows.\n\nCan be used as graduated filter (increase Scope)
 TP_LOCALLAB_SHAMASKCOL;Shadows mask
 TP_LOCALLAB_SHAPETYPE;Shape RT-spot area
-TP_LOCALLAB_SHAPE_TOOLTIP;Elipse is normal mode.\nRectangle can be used in some cases, for example to work in full image in conjonction with delimiters outside preview, transition = 100
+TP_LOCALLAB_SHAPE_TOOLTIP;Elipse is normal mode.\nRectangle can be used in some cases, for example to work in full image in conjonction with delimiters outside preview, transition = 100.\n\nPolygone - Beziers are waiting for GUI...
 TP_LOCALLAB_SHARAMOUNT;Amount
 TP_LOCALLAB_SHARBLUR;Blur radius
 TP_LOCALLAB_SHARDAMPING;Damping
@@ -2739,7 +2740,7 @@ TP_LOCALLAB_STRGRID;Strength
 TP_LOCALLAB_STRRETI_TOOLTIP;if Strength Retinex < 0.2 only Dehaze is enabled.\nif Strength Retinex >= 0.1 Dehaze is in luminance mode.
 TP_LOCALLAB_STRUC;Structure
 TP_LOCALLAB_STRUCCOL1;Structure Spot
-TP_LOCALLAB_STRUCT_TOOLTIP;Use Sobel algorithm to take into account structure in shape detection.\nyou can have a preview by activating "mask and modifications - Show structure spot" 
+TP_LOCALLAB_STRUCT_TOOLTIP;Use Sobel algorithm to take into account structure in shape detection.\nyou can have a preview by activating "mask and modifications - Show structure spot".\n\nCan be used in conjunction with masks (expert) structure, blur, wavelet to improve edge detection
 TP_LOCALLAB_STRUCCOL;Structure
 TP_LOCALLAB_STRUMASKCOL;Structure mask strength
 TP_LOCALLAB_STRUMASK_TOOLTIP;Generate a structure mask with difference between surface areas and reliefs.\nIf structure mask as tool is enabled, this mask is used in addition to the other tools (gamma, slope, contrast curve ...)
diff --git a/rtengine/procparams.cc b/rtengine/procparams.cc
index 66e05effe..e5cc10515 100644
--- a/rtengine/procparams.cc
+++ b/rtengine/procparams.cc
@@ -2578,7 +2578,7 @@ LocallabParams::LocallabSpot::LocallabSpot() :
     avoid(false),
     blwh(false),
     recurs(false),
-    laplac(false),
+    laplac(true),
     deltae(true),
     shortc(false),
     savrest(false),
@@ -3077,7 +3077,7 @@ LocallabParams::LocallabSpot::LocallabSpot() :
     strengr(0),
     scalegr(100),
     epsbl(0),
-    blMethod("guid"),
+    blMethod("blur"),
     chroMethod("lum"),
     blurMethod("norm"),
     medMethod("33"),
diff --git a/rtgui/controlspotpanel.cc b/rtgui/controlspotpanel.cc
index cfceec484..e901e0d74 100644
--- a/rtgui/controlspotpanel.cc
+++ b/rtgui/controlspotpanel.cc
@@ -410,6 +410,7 @@ ControlSpotPanel::ControlSpotPanel():
     if (showtooltip) {
         savrest_->set_tooltip_text(M("TP_LOCALLAB_SAVREST_TOOLTIP"));
         lumask_->set_tooltip_text(M("TP_LOCALLAB_LUMASK_TOOLTIP"));
+        laplac_->set_tooltip_text(M("TP_LOCALLAB_LAP_MASK_TOOLTIP"));
     }
 
     maskBox->pack_start(*laplac_);