diff --git a/indivisible.1 b/indivisible.1
index 73db884..16648d9 100644
--- a/indivisible.1
+++ b/indivisible.1
@@ -16,6 +16,9 @@ The ordinal of the prime to be found
 \fB\-i\fR, \fB\-\-import\fR <\fIFILE\fR>
 Import prime numbers from \fIFILE\fR
 .TP
+\fB\-t\fR, \fB\-\-test\fR
+Test if n is a prime instead of generation
+.TP
 \fB\-v\fR, \fB\-\-verbose\fR
 Print all found primes
 .TP