diff --git a/documentation/RELEASE_NOTES.html b/documentation/RELEASE_NOTES.html
index ce6a00896..48f48c64e 100644
--- a/documentation/RELEASE_NOTES.html
+++ b/documentation/RELEASE_NOTES.html
@@ -90,6 +90,13 @@ from <tt>const</tt> links.</li>
 
 </ul>
 
+<pre>
+  field(INP, {calc:{expr:"A+B+1",
+                    args:[{const:5}, # A
+                          {const:6}] # B
+             }})
+</pre>
+
 <p>The new link types are documented in a
 <a href="links.html">separate</a><!-- href for the EPICS website -->
 <a href="../html/links.html">document</a><!-- href for install tree -->
diff --git a/src/std/link/lnkCalc.c b/src/std/link/lnkCalc.c
index 70d47426e..7f311d017 100644
--- a/src/std/link/lnkCalc.c
+++ b/src/std/link/lnkCalc.c
@@ -6,7 +6,11 @@
 \*************************************************************************/
 /* lnkCalc.c */
 
-/* TODO:
+/*  Current usage
+ *      {calc:{expr:"A", args:[{...}, ...]}}
+ *  First link in 'args' is 'A', second is 'B', and so forth.
+ *
+ *  TODO:
  *    Support setting individual input links instead of the args list.
  *      {calc:{expr:"K", K:{...}}}
  */