dot: make a man page note about 'SIGUSR1' effects

diff --git a/CHANGELOG.md b/CHANGELOG.md
index cf4583472313b0c289237a455a5e7bbee9c1dae2..51668143795c894f399ba02a4c342f0a0a40e110 100644 (file)
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 - the `mingle` binary is now included in the CMake build
+- a brief note about the (previously undocumented) behavior of Graphviz when
+  sent `SIGUSR1` is now mentioned in the man page
 
 ### Fixed
 

diff --git a/cmd/dot/dot.1 b/cmd/dot/dot.1
index 8e00b75141c1ce413dd0f639c78272d8054ef16a..d17ffe196b17eca9dadacb2dbfb33ed7b48697e7 100644 (file)
--- a/cmd/dot/dot.1
+++ b/cmd/dot/dot.1
@@ -735,4 +735,6 @@ Available https://www.graphviz.org/pdf/neatoguide.pdf.
 .br
 E. R. Gansner and Y. Hu, "Efficient, Proximity-Preserving Node Overlap Removal",
 J. Graph Algorithms Appl., 14(1) pp. 53\(hy74, 2010. 
-
+.SH "NOTES"
+On non-Windows platforms, sending \fBSIGUSR1\fR to Graphviz can be used to
+toggle on and off some extra points reporting in the neatogen code.