diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 7d797445714..5087742568e 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -138,7 +138,7 @@ void PrintConfigDef::init_common_params()
     def = this->add("slice_closing_radius", coFloat);
     def->label = L("Slice gap closing radius");
     def->category = OptionCategory::slicing;
-    def->tooltip = L("Cracks smaller than 2x gap closing radius are being filled during the triangle mesh slicing. "
+    def->tooltip = L("Cracks smaller than 2x gap closing radius are filled during the triangle mesh slicing. "
                      "The gap closing operation may reduce the final print resolution, therefore it is advisable to keep the value reasonably low.");
     def->sidetext = L("mm");
     def->min = 0;
@@ -223,7 +223,7 @@ void PrintConfigDef::init_fff_params()
     def->label = L("Allow empty layers");
     def->full_label = L("Allow empty layers");
     def->category = OptionCategory::slicing;
-    def->tooltip = L("Do not prevent the gcode builder to trigger an exception if a full layer is empty and so the print will have to start from thin air afterward.");
+    def->tooltip = L("Prevent the gcode builder from triggering an exception if a full layer is empty, and allow the print to start from thin air afterward.");
     def->mode = comExpert;
     def->set_default_value(new ConfigOptionBool(false));
 
@@ -240,7 +240,7 @@ void PrintConfigDef::init_fff_params()
     def->label = L("Don't avoid crossing on 1st layer");
     def->full_label = L("Don't avoid crossing on 1st layer");
     def->category = OptionCategory::perimeter;
-    def->tooltip = L("Do not use the 'Avoid crossing perimeters' on the first layer.");
+    def->tooltip = L("Disable 'Avoid crossing perimeters' for the first layer.");
     def->mode = comExpert;
     def->set_default_value(new ConfigOptionBool(true));
 
@@ -249,7 +249,7 @@ void PrintConfigDef::init_fff_params()
     def->category = OptionCategory::perimeter;
     def->tooltip = L("The maximum detour length for avoid crossing perimeters. "
                      "If the detour is longer than this value, avoid crossing perimeters is not applied for this travel path. "
-                     "Detour length could be specified either as an absolute value or as percentage (for example 50%) of a direct travel path.");
+                     "Detour length can be specified either as an absolute value or as percentage (for example 50%) of a direct travel path.");
     def->sidetext = L("mm or % (zero to disable)");
     def->min = 0;
     def->mode = comExpert;
@@ -4008,13 +4008,15 @@ void PrintConfigDef::init_fff_params()
     def->sidetext = L("perimeters");
     def->sidetext_width = 20;
     def->category = OptionCategory::perimeter;
-    def->tooltip = L("When you have a medium/hight number of top/bottom solid layers, and a low/medium of perimeters,"
-        " then it have to put some solid infill inside the part to have enough solid layers."
-        "\nBy setting this to something higher than 0, you can remove this 'inside filling'."
-        " This number allow to keep some if there is a low number of perimeter over the void."
-        "\nIf this setting is equal or higher than the top/bottom solid layer count, it won't evict anything."
-        "\nIf this setting is set to 1, it will evict all solid fill are are only over perimeters."
-        "\nSet zero to disable."
+    def->tooltip = L("In sloping areas, when you have a number of top/bottom solid layers and few perimeters,"
+        " it may be necessary to put some solid infill above/below the perimeters to fulfill the top/bottom layers criteria."
+        "\nBy setting this to something higher than 0, you can control this behaviour, which might be desirable if "
+	"\nundesirable solid infill is being generated on slopes."
+        "\nThe number set here indicates the number of layers between the inside of the part and the air"
+        "\nat and beyond which solid infill should no longer be added above/below. If this setting is equal or higher than " 
+	"\nthe top/bottom solid layer count, it won't do anything. If this setting is set to 1, it will evict "
+	"\nall solid fill above/below perimeters. "
+	"\nSet zero to disable."
         "\n!! ensure_vertical_shell_thickness may be erased by this setting !! You may want to deactivate at least one of the two.");
     def->min = 0;
     def->mode = comAdvanced;