[groff] 10/29: tmac/s.tmac: Clarify a comment.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 0d32dd8d69bafc5c226b924ca4f9727f740b7807
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Sun Apr 17 16:22:22 2022 +1000

    tmac/s.tmac: Clarify a comment.
---
 tmac/s.tmac | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/tmac/s.tmac b/tmac/s.tmac
index 2317b8ee..9faf88ad 100644
--- a/tmac/s.tmac
+++ b/tmac/s.tmac
@@ -2133,10 +2133,14 @@ along with this program.  If not, see 
<http://www.gnu.org/licenses/>.
 .\" ****************************
 .\" Emulate Bell Labs localisms. Note, (a) they're not documented, and
 .\" (b) the .P1 and .UC macros collide with different ones in Berkeley
-.\" ms.  We hack around this by conditionalizing the behavior of P1; UC
-.\" was not defined by groff and will be a no-op if called Berkeley
-.\" style with no arguments, so there is no problem with hijacking it
-.\" here.
+.\" ms.
+.\"
+.\" [Correction 2022-04-17: 10th Edition AT&T ms also collides with
+.\" Berkeley's (undocumented) FP macro.]
+.\"
+.\" We hack around this by conditionalizing the behavior of P1; UC was
+.\" not defined by groff and will be a no-op if called Berkeley style
+.\" with no arguments, so there is no problem with hijacking it here.
 .\"
 .\" What's done here is sufficient to give back the Guide to EQN (1976)
 .\" its section headings and restore some text that had gone missing as