1 files changed, 1 insertions, 2 deletions
diff --git a/ff2ppm.1 b/ff2ppm.1
index feba2f3..c611fba 100644
--- a/ff2ppm.1
+++ b/ff2ppm.1
@@ -20,8 +20,7 @@ writes a diagnostic message to stderr.
 .Sh OPTIONS
 .Bl -tag -width Ds
 .It Fl b Ar colour
-.Ar colour
-Mix the background alpha channel with
+Blend the transparent colours with
 .Ar colour
 specified as rgb, rrggbb or rrrrggggbbbb. The default is fff.
 .El