.appendix RUNOFF LIMITATIONS
RUNOFF has some limitations as a general text formatting program.  The
foremost is its inability to look ahead for formatting text
based on what will be happening in the next few lines.
Here is a partial list of some other problems with some suggestions as
to what you can do to alleviate them. 
.list
.le Sometimes a word can be hyphenated between pages.  This can  happen,
for example, on
a page with a footnote, or if .IMMEDIATE TEST is used to prevent dangling
lines on the next page.  Hyphenation is usually inhibited for the last line of
a page, but RUNOFF can sometimes get confused when dealing with several
commands at the same time.  A solution to this problem
is to .DISABLE HYPHENATION, or use the hyphenation flag to declare the
offending word ineligible for hyphenation.  If the problem occurs in a
footnote, an alternate solution is to place
the footnote between paragraphs, and break the line
before the footnote command.
.le Similarly, RUNOFF can hyphenate the last word of a paragraph.
This is easily fixed by using the hyphenate flag in front of the last
word of each paragraph.  An alternate method is to disable hyphenation
for any word ending with a period.  This has the unfortunate side effect
of preventing hyphenation at the end of every sentence.
.le Footnotes sometimes appear on the page before the line that refers to
them. This problem can be avoided by starting the footnote about 1 line
after the reference.  However, this may make the footnote appear on the next
page after the reference, if the reference is too near to the bottom of the
page. If this occurs, the
_.IMMEDIATE TEST TEXT command can be used before the reference to force both
the reference and footnote onto the same page.
.end list