diff --git a/udev.8 b/udev.8
index 6ee68d795e..c78fd4a32b 100644
--- a/udev.8
+++ b/udev.8
@@ -190,8 +190,12 @@ The kernel minor number for the device.
 The bus id for the device.
 .TP
 .B %c
-The CALLOUT program returned string.
-(This does not work within the PROGRAM field for the obvious reason.)
+The
+.B PROGRAM
+returned string.
+(This does not work within the
+.B PROGRAM
+field for the obvious reason.)
 .TP
 .B %D
 Use the devfs style disk name for this device.