diff --git a/NumericalData/CDPP-AMDA/OMNI/omni-1min-all.xml b/NumericalData/CDPP-AMDA/OMNI/omni-1min-all.xml
index 885fc3f..3039998 100644
--- a/NumericalData/CDPP-AMDA/OMNI/omni-1min-all.xml
+++ b/NumericalData/CDPP-AMDA/OMNI/omni-1min-all.xml
@@ -12,6 +12,8 @@
               geomagnetic indices, Polar Cap (Thule) index, F10.7 index, and Rz (sunspot number). 
               The ram pressure is calculated using P=rho*Np*Vp², where rho=1.672622*(1+4*(1/(1-He++_ratio)-1)). 
               We use rho=2 here, which corresponds to a ratio of He++ between 4% and 5%.
+
+              Determination of bow shock nose location : https://omniweb.gsfc.nasa.gov/html/HROdocum.html#ap4
             </Description>
       <Acknowledgement>We acknowledge the experiment teams that acquired, processed 
 and provided the OMNI-included data, and J.H. King and N.E. Papitashvili of NASA/GSFC 
@@ -29,6 +31,10 @@ for creating the OMNI data set.</Acknowledgement>
         <URL>http://omniweb.sci.gsfc.nasa.gov/html/ow_data.html</URL>
         <Description>Extensive OMNI documentation pages</Description>
       </InformationURL>
+      <InformationURL>
+        <Name>Determination of bow shock nose location</Name>
+        <URL>https://omniweb.gsfc.nasa.gov/html/HROdocum.html#ap4</URL>
+      </InformationURL>
     </ResourceHeader>
     <AccessInformation>
       <RepositoryID>spase://SMWG/Repository/CDPP/AMDA</RepositoryID>
diff --git a/NumericalData/CDPP-AMDA/OMNI/omni-1min-v2.xml b/NumericalData/CDPP-AMDA/OMNI/omni-1min-v2.xml
index 012f17e..ef59822 100644
--- a/NumericalData/CDPP-AMDA/OMNI/omni-1min-v2.xml
+++ b/NumericalData/CDPP-AMDA/OMNI/omni-1min-v2.xml
@@ -12,6 +12,8 @@
               geomagnetic indices, Polar Cap (Thule) index, F10.7 index, and Rz (sunspot number). 
               The ram pressure is calculated using P=rho*Np*Vp², where rho=1.672622*(1+4*(1/(1-He++_ratio)-1)).
               We use rho=2 here, which corresponds to a ratio of He++ between 4% and 5%.
+
+              Determination of bow shock nose location : https://omniweb.gsfc.nasa.gov/html/HROdocum.html#ap4
             </Description>
       <Acknowledgement>We acknowledge the experiment teams that acquired, processed 
 and provided the OMNI-included data, and J.H. King and N.E. Papitashvili of NASA/GSFC 
@@ -29,6 +31,10 @@ for creating the OMNI data set.</Acknowledgement>
         <URL>http://omniweb.sci.gsfc.nasa.gov/html/ow_data.html</URL>
         <Description>Extensive OMNI documentation pages</Description>
       </InformationURL>
+      <InformationURL>
+        <Name>Determination of bow shock nose location</Name>
+        <URL>https://omniweb.gsfc.nasa.gov/html/HROdocum.html#ap4</URL>
+      </InformationURL>
     </ResourceHeader>
     <AccessInformation>
       <RepositoryID>spase://SMWG/Repository/CDPP/AMDA</RepositoryID>
diff --git a/NumericalData/CDPP-AMDA/OMNI/omni-5min-all.xml b/NumericalData/CDPP-AMDA/OMNI/omni-5min-all.xml
index 3efe202..cba4469 100644
--- a/NumericalData/CDPP-AMDA/OMNI/omni-5min-all.xml
+++ b/NumericalData/CDPP-AMDA/OMNI/omni-5min-all.xml
@@ -10,6 +10,8 @@
       <Description>5 min averaged, multi-source, near-Earth solar wind magnetic 
               field, plasma and energetic proton flux data, plus AE, AU, AL, Kp, ap, and Dst 
               geomagnetic indices, Polar Cap (Thule) index, F10.7 index, and Rz (sunspot number).
+
+              Determination of bow shock nose location : https://omniweb.gsfc.nasa.gov/html/HROdocum.html#ap4
             </Description>
       <Acknowledgement>We acknowledge the experiment teams that acquired, processed 
 and provided the OMNI-included data, and J.H. King and N.E. Papitashvili of NASA/GSFC 
@@ -27,6 +29,10 @@ for creating the OMNI data set.</Acknowledgement>
         <URL>http://omniweb.sci.gsfc.nasa.gov/html/ow_data.html</URL>
         <Description>Extensive OMNI documentation pages</Description>
       </InformationURL>
+      <InformationURL>
+        <Name>Determination of bow shock nose location</Name>
+        <URL>https://omniweb.gsfc.nasa.gov/html/HROdocum.html#ap4</URL>
+      </InformationURL>
     </ResourceHeader>
     <AccessInformation>
       <RepositoryID>spase://SMWG/Repository/CDPP/AMDA</RepositoryID>
diff --git a/NumericalData/CDPP-AMDA/OMNI/omni-5min-v2.xml b/NumericalData/CDPP-AMDA/OMNI/omni-5min-v2.xml
index 6417266..32d0686 100644
--- a/NumericalData/CDPP-AMDA/OMNI/omni-5min-v2.xml
+++ b/NumericalData/CDPP-AMDA/OMNI/omni-5min-v2.xml
@@ -9,7 +9,9 @@
       <ReleaseDate>2023-09-07T05:48:06Z</ReleaseDate>
       <Description>5 min averaged, multi-source, near-Earth solar wind magnetic 
               field, plasma and energetic proton flux data, plus AE, AU, AL, Kp, ap, and Dst 
-              geomagnetic indices, Polar Cap (Thule) index, F10.7 index, and Rz (sunspot number).  
+              geomagnetic indices, Polar Cap (Thule) index, F10.7 index, and Rz (sunspot number).
+
+              Determination of bow shock nose location : https://omniweb.gsfc.nasa.gov/html/HROdocum.html#ap4
             </Description>
       <Acknowledgement>We acknowledge the experiment teams that acquired, processed 
 and provided the OMNI-included data, and J.H. King and N.E. Papitashvili of NASA/GSFC 
@@ -27,6 +29,10 @@ for creating the OMNI data set.</Acknowledgement>
         <URL>http://omniweb.sci.gsfc.nasa.gov/html/ow_data.html</URL>
         <Description>Extensive OMNI documentation pages</Description>
       </InformationURL>
+      <InformationURL>
+        <Name>Determination of bow shock nose location</Name>
+        <URL>https://omniweb.gsfc.nasa.gov/html/HROdocum.html#ap4</URL>
+      </InformationURL>
     </ResourceHeader>
     <AccessInformation>
       <RepositoryID>spase://SMWG/Repository/CDPP/AMDA</RepositoryID>
@@ -110,6 +116,8 @@ for creating the OMNI data set.</Acknowledgement>
       </RenderingHints>
       <Structure>
         <Size>3</Size>
+
+              Determination of bow shock nose location : https://omniweb.gsfc.nasa.gov/html/HROdocum.html#ap4
         <Element>
           <Name>bx</Name>
           <Index>1</Index>
--
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