diff --git a/rtdata/languages/default b/rtdata/languages/default
index 9902fddf5..ba47a6bb1 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -2089,7 +2089,9 @@ TP_LOCALLAB_LIGHTRETI;Lightness
 TP_LOCALLAB_THRESRETI;Threshold
 TP_LOCALLAB_DENOIS;Denoise
 TP_LOCALLAB_DEHAZ;Dehaze
-TP_LOCALLAB_EXPMETHOD_TOOLTIP;Standard : use an algorithm similar as main Exposure but in L*a*b* and taking account of deltaE.\n\nLaplacian & PDE : use another algorithm also with deltaE and with Poisson equation to solve Laplacian in Fourier space.\nPDE lead to very different results and needs differents settings that Standard (negative black, gamma < 1,...)\nMay be usefull for low exposure.\nPDE reduce artifacts and noise. 
+TP_LOCALLAB_EXPMETHOD_TOOLTIP;Standard : use an algorithm similar as main Exposure but in L*a*b* and taking account of deltaE.\n\nLaplacian & PDE : use another algorithm also with deltaE and with Poisson equation to solve Laplacian in Fourier space.\nPDE Ipol and PDE Fattal can be combined.\nFFTW Fourier Transform is optimized in size to reduce processing time.\nPDE reduce artifacts and noise.
+TP_LOCALLAB_PDEFRAME_TOOLTIP;PDE Ipol - personal algorithm adapted from Ipol to Rawtherapee: lead to very different results and needs differents settings that Standard (negative black, gamma < 1,...)\nMay be usefull for low exposure.\n
+TP_LOCALLAB_FATFRAME_TOOLTIP;PDE Fattal - use Fattal Tone mapping algorithm.\nAnchor allows selection according to the images over or under exposed.
 TP_LOCALLAB_FFTW;Use Fast Fourier Transform
 TP_LOCALLAB_GRIDONE;Color Toning
 TP_LOCALLAB_GRIDTWO;Direct
diff --git a/rtgui/locallab.cc b/rtgui/locallab.cc
index e6eee9fb8..6a5c7c43c 100644
--- a/rtgui/locallab.cc
+++ b/rtgui/locallab.cc
@@ -815,6 +815,9 @@ Locallab::Locallab():
 
 
     pdeFrame->set_label_align(0.025, 0.5);
+    if (showtooltip) {
+        pdeFrame->set_tooltip_text(M("TP_LOCALLAB_PDEFRAME_TOOLTIP"));
+    }
     ToolParamBlock* const pdeBox = Gtk::manage(new ToolParamBlock());
     pdeBox->pack_start(*laplacexp);
     pdeBox->pack_start(*linear);
@@ -822,6 +825,9 @@ Locallab::Locallab():
     pdeBox->pack_start(*gamm);
 
     fatFrame->set_label_align(0.025, 0.5);
+    if (showtooltip) {
+        fatFrame->set_tooltip_text(M("TP_LOCALLAB_FATFRAME_TOOLTIP"));
+    }
     ToolParamBlock* const fatBox = Gtk::manage(new ToolParamBlock());
     fatBox->pack_start(*fatamount);
     fatBox->pack_start(*fatdetail);
@@ -833,12 +839,11 @@ Locallab::Locallab():
     ToolParamBlock* const exposeBox = Gtk::manage(new ToolParamBlock());
     exposeBox->pack_start(*expMethod);
     exposeBox->pack_start(*pdeFrame);
+    exposeBox->pack_start(*black);
     exposeBox->pack_start(*fatFrame);
-
     exposeBox->pack_start(*expcomp);
     exposeBox->pack_start(*hlcompr);
     exposeBox->pack_start(*hlcomprthresh);
-    exposeBox->pack_start(*black);
     exposeBox->pack_start(*shadex);
     exposeBox->pack_start(*shcompr);
     exposeBox->pack_start(*expchroma);