diff --git a/doc/asterisk.8 b/doc/asterisk.8
index 15d7ab78ad..d566480f27 100644
--- a/doc/asterisk.8
+++ b/doc/asterisk.8
@@ -98,7 +98,7 @@ option also implies \*(T<\fB\-f\fR\*(T> (no forking). However when
 connecting to an existing Asterisk instance (\*(T<\fB\-r\fR\*(T> or
 \*(T<\fB\-R\fR\*(T>), it may only increase the debug level.
 .TP 
--e \fImemory\fR
+\-e \fImemory\fR
 Limit the generation of new channels when the amount of free memory 
 has decreased to under \fImemory\fR megabytes.
 Equivalent to \*(T<\fBminmemfree = \fR\*(T>\fImemory\fR in