diff --git a/smem.8 b/smem.8
index 43418a4..f6ab5c1 100644
--- a/smem.8
+++ b/smem.8
@@ -48,6 +48,7 @@ source tree.)
 Amount of physical RAM.  This lets smem detect the amount of memory used
 by firmware/hardware in the systemwide (\-w) output.  If provided, it
 will also be used as the total memory size to base percentages on.
+Example: --realmem=1024M
 
 .TP
 .BI "\-S " SOURCE ", \-\-source=" SOURCE