diff --git a/TODO b/TODO
index acb22c6..4923299 100644
--- a/TODO
+++ b/TODO
@@ -15,7 +15,7 @@ link
 color invert
 
 ==Future==
-combine lines
+combine lines (unwarp)
 Printing
 multiple charcode mapped to a same glyph
 check if we can add information to the font, and let browsers show ligatures automatically
diff --git a/pdf2htmlEX.1 b/pdf2htmlEX.1
index ce36b76..26cfdc1 100644
--- a/pdf2htmlEX.1
+++ b/pdf2htmlEX.1
@@ -86,6 +86,8 @@ pdf2htmlEX would insert a whitespace character ' ' if the distance between two c
 Many web browsers limit the minimum font size, and many would round the given font size, which results in incorrect rendering.
 
 Specify a ratio greater than 1 would resolve this issue.
+
+For some versions of Firefox, however, there will be a problem when the font size is too large, in which case a smaller value should be specified here.
 .TP
 .B --always-apply-tounicode <0|1> (Default: 0)
 A ToUnicode map may be provided for fonts in PDF which indicates the 'meaning' of the characters.