diff --git a/bison.spec b/bison.spec
index 376be5a..a94392a 100644
--- a/bison.spec
+++ b/bison.spec
@@ -38,6 +38,16 @@ using Bison, you might want to link with this library.  This library
 is not required by all Bison-generated parsers, but may be employed by
 simple programs to supply minimal support for the generated parsers.
 
+# -ly is kept static.  It only contains two symbols: main and yyerror,
+# and both of these are extremely simple (couple lines of C total).
+# It doesn't really pay off to introduce a shared library for that.
+#
+# Therefore -devel subpackage could have been created as -static, but
+# the split was done in Jan 2005, which predates current guidelines.
+# Besides there is logic to that: the library is devel in the sense
+# that the generated parser could be distributed together with other
+# sources, and only bison-devel would be necessary to wrap the build.
+
 %package runtime
 Summary: Runtime support files used by Bison-generated parsers
 Group: Development/Libraries