diff --git a/DocRegExt.tex b/DocRegExt.tex
index 39e75b6..dbe37a4 100644
--- a/DocRegExt.tex
+++ b/DocRegExt.tex
@@ -270,12 +270,28 @@ \section{The DocRegExt Schema}
 relationship\_type\footnote{\url{https://www.ivoa.net/rdf/voresource/relationship_type}}
 defines what terms are legal in the declaration of relationships.
 Document records should preferably use \vocterm{Cites} and
-in particular declare relationships to tools.  If these are not
-registered, use the name of their binary as the name of the related
-resource; this will very typically be lowercase-only.  Tutorials
+in particular declare relationships to tools.  For VO-registered
+services or standards, these relationships should provide the services' ivoids.
+Tutorials
 specifically introducing one or more services should define
 \vocterm{IsSupplementTo} relationships to these services.
 
+Client-side software or libraries do not have Registry records.  To
+reliably identify software, DocRegExt recommends the use of
+ASCL\footnote{\url{https://www.ascl.net}} identifiers.  These should be
+used in the \verb|relatedResource| element's \verb|altIdentifier|
+attribute.  For instance, to declare that a tutorial uses the Cassis
+client, it would say:
+
+\begin{lstlisting}[language=XML,basicstyle=\footnotesize]
+<relationship>
+  <relationshipType>Cites</relationshipType>
+  <relatedResource>Specflow</relatedResource>
+  <relatedResource altIdentifier="ascl:1402.013"
+    >Cassis</relatedResource>
+</relationship>
+\end{lstlisting}
+
 Document-typed resource records should contain a \vorent{date} element
 with a \vorent{role} of \emph{Inspected}.  This should correspond to the
 last time that the current editor has made sure the tutorial or use case
@@ -409,6 +425,19 @@ \section{Locating Texts using RegTAP}
 language.
 \end{itemize}
 
+To locate texts defining relationships to specific software tools, use
+the relationship table's alt\_identifier column, for instance like this:
+
+\begin{lstlisting}[language=SQL]
+SELECT ivoid, res_title, related_name FROM
+  rr.resource
+  NATURAL JOIN rr.relationship
+WHERE
+  res_type='doc:document'
+  and related_alt_identifier='ascl:1112.019'
+\end{lstlisting}
+
+
 The downside of not defining an extra table for the documents is that
 the query patterns in RegTAP are somewhat clumsy.  For instance, to list
 the English and Italian titles of all texts available in Italian, one
@@ -509,7 +538,14 @@ \section{A versioned repository for tutorials}
 
 \section{Changes}
 
-\subsection{Changes from WD-1.0}
+\subsection{Changes from PR-1.0-2025-11-02}
+
+\begin{itemize}
+\item Recommending the usage of ASCL identifiers to declare
+relationships to software.
+\end{itemize}
+
+\subsection{Changes from WD-1.0-20230426}
 
 None.
 
diff --git a/dfbs-example.xml b/dfbs-example.xml
index 1720fa9..6e433a0 100644
--- a/dfbs-example.xml
+++ b/dfbs-example.xml
@@ -41,9 +41,9 @@ identification of misclassified objects from reference databases.</description>
     <contentLevel>Amateur</contentLevel>
     <relationship>
       <relationshipType>Cites</relationshipType>
-      <relatedResource>TOPCAT</relatedResource>
-      <relatedResource>Aladin</relatedResource>
-      <relatedResource>astropy</relatedResource>
+      <relatedResource altIdentifier="ascl:1101.010">TOPCAT</relatedResource>
+      <relatedResource altIdentifier="ascl:1112.019">Aladin</relatedResource>
+      <relatedResource altIdentifier="ascl:1304.002">astropy</relatedResource>
       <relatedResource ivo-id="ivo://cds.vizier/iii/227">General Catalog of galactic Carbon stars, 3d Ed.</relatedResource>
       <relatedResource ivo-id="ivo://byu.arvo/tap">ArVO Byurakan TAP service</relatedResource>
       <relatedResource ivo-id="ivo://cds.simbad/tap">SIMBAD TAP query engine</relatedResource>
diff --git a/m1distance-example.xml b/m1distance-example.xml
index a832981..3d25a3e 100644
--- a/m1distance-example.xml
+++ b/m1distance-example.xml
@@ -30,7 +30,6 @@ may be gained from very simple arguments and geometry.</description>
     <contentLevel>General</contentLevel>
     <relationship>
       <relationshipType>Cites</relationshipType>
-      <relatedResource>The ALADIN image server</relatedResource>
       <relatedResource>Aladin</relatedResource>
     </relationship>
   </content>