diff --git a/filename-extension.scm b/filename-extension.scm
index 437e4a6..e557e3e 100644
--- a/filename-extension.scm
+++ b/filename-extension.scm
@@ -48,7 +48,7 @@
 
 (id ".spi")
 (stands-for "Scheme package interface")
-(description "ScmPkg package definition file")
+(description "ScmPkg package definition file [Bigloo, STklos]")
 
 (id ".stk")
 (stands-for "STk")