diff --git a/gpl-lgpl.tex b/gpl-lgpl.tex
index 291998ef638919e808f8293224e8a8d3860c1194..40439132f631a4d7ac36f6a5ac855e2faf94dc9b 100644
--- a/gpl-lgpl.tex
+++ b/gpl-lgpl.tex
@@ -3846,7 +3846,19 @@ Instead, GPLv3~\S11\P3--5 are specifically concerned with explicit promises
 that are purportedly legally enforceable.
 
 Nevertheless, unlike traditional commercial patent licensing
-agreements\footnote{FIXME: note such a clause is rare, if not unique.},
+agreements\footnote{Typically, well-drafted commercial patent license
+  agreements explicitly exclude any possibility of
+  implied licenses.  Thus, GPLv3's final paragraph may be unique among both commercial
+  agreements and/or other Free Software licenses (both copyleft and
+  non-copyleft).  Careful study of the patent licensing implications of GPL
+  should not ignore this observation.  In particular, contrast carefully the
+  goals of commercial patent licensing agreements and the policy goals of a
+  copyleft license.  Namely, patent license granters typically draft patent license
+  to explicitly license only a narrow set of patents.  However, FSF sought to assure
+  patent licenses for all Free Software users, redistributors, and developers.
+  While  GPLv3\S11 undoubtedly contains some compromises regarding explicit
+  patent licensing, FSF did not compromise on bringing forward GPLv2's
+  existing implicit patent license.},
 rather than confining the patent license grant to some narrow set of such
 express situations, GPLv3 preserves the
 \hyperref[gpl-implied-patent-grant]{existing implied patent licensing structure}
