diff --git a/docs/formats.txt b/docs/formats.txt
index 4ffc97c6e..243919850 100644
--- a/docs/formats.txt
+++ b/docs/formats.txt
@@ -122,8 +122,8 @@ MAC  ---     PS     TYPE_1  ---        type1    T1_SPEC.pdf
                                                 probably never supported)
 
 
----  ---     WINFNT ---     ---        winfonts MS Windows 3 Developer's Notes
----  ---     WINFNT VECTOR  ---        ---      MS Windows 3 Developer's Notes
+---  ---     WINFNT ---     ---        winfonts Windows developer's notes [5]
+---  ---     WINFNT VECTOR  ---        ---      Windows developer's notes [5]
 
 
 [1] Support should be rather simple since this is identical to `CFF' but
@@ -159,6 +159,10 @@ MAC  ---     PS     TYPE_1  ---        type1    T1_SPEC.pdf
 
       http://fontforge.sourceforge.net/pcf-format.html
 
+[5] This is from MS Windows 3; see Microsoft's Knowledge Base article at
+
+      http://support.microsoft.com/kb/65123
+
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