diff --git a/make.1 b/make.1
index 128ce761..4d6cd625 100644
--- a/make.1
+++ b/make.1
@@ -155,7 +155,7 @@ searched in the order specified.
 Unlike the arguments to other flags of 
 .IR make ,
 directories given with
-. \-I
+.B \-I
 flags may come directly after the flag:
 .BI \-I dir
 is allowed, as well as