diff --git a/rtdata/languages/default b/rtdata/languages/default
index 5a66807ca..02ded5378 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -1818,6 +1818,7 @@ TP_PRSHARPENING_LABEL;Post-Resize Sharpening
 TP_PRSHARPENING_TOOLTIP;Sharpens the image after resizing. Only works when the "Lanczos" resizing method is used. It is impossible to preview the effects of this tool. See RawPedia for usage instructions.
 TP_RAWCACORR_AUTO;Auto-correction
 TP_RAWCACORR_AUTOIT;Iterations
+TP_RAWCACORR_AUTOIT_TOOLTIP;This setting is available if "Auto-correction" is checked.\nAuto-correction is conservative, means it often does not correct all Chromatic Aberration.\nTo correct the remaining Chromatic Aberration, you can use up to 5 iterations of automatic Chromatic Aberration correction.\nEach iteration will reduce the remaining Chromatic Aberration from the last iteration at the cost of additional processing time.
 TP_RAWCACORR_AVOIDCOLORSHIFT;Avoid color shift
 TP_RAWCACORR_CABLUE;Blue
 TP_RAWCACORR_CARED;Red
diff --git a/rtgui/rawcacorrection.cc b/rtgui/rawcacorrection.cc
index b208f5509..2daeb102f 100644
--- a/rtgui/rawcacorrection.cc
+++ b/rtgui/rawcacorrection.cc
@@ -41,6 +41,7 @@ RAWCACorr::RAWCACorr () : FoldableToolPanel(this, "rawcacorrection", M("TP_CHROM
 
     caAutoiterations = Gtk::manage(new Adjuster (M("TP_RAWCACORR_AUTOIT"), 1, 5, 1, 2));
     caAutoiterations->setAdjusterListener (this);
+    caAutoiterations->set_tooltip_markup(M("TP_RAWCACORR_AUTOIT_TOOLTIP"));
 
     if (caAutoiterations->delay < options.adjusterMaxDelay) {
         caAutoiterations->delay = options.adjusterMaxDelay;