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-rw-r--r--doc/groff.texinfo5
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/groff.texinfo b/doc/groff.texinfo
index 83bec112..017ea32e 100644
--- a/doc/groff.texinfo
+++ b/doc/groff.texinfo
@@ -14166,7 +14166,10 @@ Compatibility mode can be also turned on with the @option{-C} command line
option.
The @code{do} request turns off compatibility mode
-while executing its arguments as a @code{gtroff} command.
+while executing its arguments as a @code{gtroff} command. However, it
+does not turn off compatibility mode while processing the macro itself.
+To do that, use the @code{de1} request (or manipulate the @code{.C}
+register manually). @xref{Writing Macros}.
@Example
.do fam T