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| -rw-r--r-- | doc/flex.texi | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/flex.texi b/doc/flex.texi index ae744c3..130cf09 100644 --- a/doc/flex.texi +++ b/doc/flex.texi @@ -8272,7 +8272,8 @@ As you can see, there really is no magic here. We just use @section M4 Dependency @cindex m4 The macro processor @code{m4}@footnote{The use of m4 is subject to change in -future revisions of flex.} must be installed wherever flex is installed. +future revisions of flex. It is not part of the public API of flex. Do not depend on it.} +must be installed wherever flex is installed. @code{flex} invokes @samp{m4}, found by searching the directories in the @code{PATH} environment variable. Any code you place in section 1 or in the actions will be sent through m4. Please follow these rules to protect your |