diff --git a/indra/newview/llfloaterenvironmentadjust.cpp b/indra/newview/llfloaterenvironmentadjust.cpp
index 18be4fffda105fa9efdaad71601fabfe83cfcadd..f3133ecb37baf9ca2ebde536b501dfd0e3d0c960 100644
--- a/indra/newview/llfloaterenvironmentadjust.cpp
+++ b/indra/newview/llfloaterenvironmentadjust.cpp
@@ -495,10 +495,12 @@ void LLFloaterEnvironmentAdjust::updateGammaLabel()
     if (ambiance != 0.f)
     {
         childSetValue("scene_gamma_label", getString("hdr_string"));
+        getChild<LLUICtrl>(FIELD_SKY_SCENE_GAMMA)->setToolTip(getString("hdr_tooltip"));
     }
     else
     {
         childSetValue("scene_gamma_label", getString("brightness_string"));
+        getChild<LLUICtrl>(FIELD_SKY_SCENE_GAMMA)->setToolTip(std::string());
     }
 }
 
diff --git a/indra/newview/llpaneleditsky.cpp b/indra/newview/llpaneleditsky.cpp
index 0a7a4763beb86ea051d3cd8b8840a487fabdb47d..839f25761a77112a85ea37dc49ccb5907c563836 100644
--- a/indra/newview/llpaneleditsky.cpp
+++ b/indra/newview/llpaneleditsky.cpp
@@ -342,10 +342,12 @@ void LLPanelSettingsSkyAtmosTab::updateGammaLabel(bool auto_adjust)
     if (ambiance != 0.f)
     {
         childSetValue("scene_gamma_label", getString("hdr_string"));
+        getChild<LLUICtrl>(FIELD_SKY_SCENE_GAMMA)->setToolTip(getString("hdr_tooltip"));
     }
     else
     {
         childSetValue("scene_gamma_label", getString("brightness_string"));
+        getChild<LLUICtrl>(FIELD_SKY_SCENE_GAMMA)->setToolTip(std::string());
     }
 
 }
diff --git a/indra/newview/skins/default/xui/en/floater_adjust_environment.xml b/indra/newview/skins/default/xui/en/floater_adjust_environment.xml
index 518a83f846a393ffeb6e0b8af59c69948293fbb2..91a1dffcb5facdcb5d2d041447534cdf180b9683 100644
--- a/indra/newview/skins/default/xui/en/floater_adjust_environment.xml
+++ b/indra/newview/skins/default/xui/en/floater_adjust_environment.xml
@@ -12,6 +12,7 @@
          can_resize="false">
   <string name="hdr_string">HDR Scale:</string>
   <string name="brightness_string">Brightness:</string>
+  <string name="hdr_tooltip">Intensity of lightning effects such as realistically bright skies and dynamic exposure. 1.0 is the default, 0 is off, values between 0 and 1 are mixing Ambient with HDR.</string>
     <layout_stack name="outer_stack"
                   width="845"
                   height="275"
@@ -263,6 +264,7 @@
                           min_val="0"
                           max_val="10"
                           name="probe_ambiance"
+                          tool_tip="Intensity of environment based indirect lighting. At zero HDR scale becomes Brightness"
                           top_pad="5"
                           width="185"
                           can_edit_text="true"/>
diff --git a/indra/newview/skins/default/xui/en/panel_settings_sky_atmos.xml b/indra/newview/skins/default/xui/en/panel_settings_sky_atmos.xml
index 2d79bc74ab8a963f2ac22f5166d694ba6e70de4b..da82c95c8384fbddb98c8df85c734b9dbe98a3c5 100644
--- a/indra/newview/skins/default/xui/en/panel_settings_sky_atmos.xml
+++ b/indra/newview/skins/default/xui/en/panel_settings_sky_atmos.xml
@@ -9,6 +9,7 @@
         top="0">
   <string name="hdr_string">HDR Scale:</string>
   <string name="brightness_string">Brightness:</string>
+  <string name="hdr_tooltip">Intensity of lightning effects such as realistically bright skies and dynamic exposure. 1.0 is the default, 0 is off, values between 0 and 1 are mixing Ambient with HDR.</string>
     <layout_stack
             name="main_ls"
             follows="all"
@@ -332,6 +333,7 @@
                           min_val="0"
                           max_val="10"
                           name="probe_ambiance"
+                          tool_tip="Intensity of environment based indirect lighting. At zero HDR scale becomes Brightness"
                           top_delta="20"
                           width="219"
                           can_edit_text="true"/>