diff --git a/lib/ftrsd/ftrsd_paper/ftrsd.lyx b/lib/ftrsd/ftrsd_paper/ftrsd.lyx
index 75c17a1b4..1166e36dc 100644
--- a/lib/ftrsd/ftrsd_paper/ftrsd.lyx
+++ b/lib/ftrsd/ftrsd_paper/ftrsd.lyx
@@ -2425,7 +2425,7 @@ reference "fig:spectrogram"
 \begin_layout Standard
 The JT65 mode has proven to be remarkably versatile.
  Thousands of users regularly use the mode for two-way communication over
- straight line-of-sight paths and the earth-moon-earth (
+ terrestrial paths and the earth-moon-earth (
 \begin_inset Quotes eld
 \end_inset