diff --git a/Doc/doc/doc.tex b/Doc/doc/doc.tex
index 449bb8b..12beaa9 100644
--- a/Doc/doc/doc.tex
+++ b/Doc/doc/doc.tex
@@ -808,6 +808,9 @@
     starts with an identifier, which should not be modified), and
     ending with the apropriate punctuation.
 
+    These macros are only defined within the content of the
+    \env{seealso} environment.
+
     \begin{macrodesc}{seemodule}{\op{key}\p{name}\p{why}}
       Refer to another module.  \var{why} should be a brief
       explanation of why the reference may be interesting.  The module