diff --git a/bench/zipf.go b/bench/zipf.go
index 0a45fcf8a..d8db2ffbe 100644
--- a/bench/zipf.go
+++ b/bench/zipf.go
@@ -57,10 +57,17 @@ The following arguments are available:
 	-db string
 		pilosa db to use
 
-	BitmapExponent  float64
-	BitmapOffset    float64
-	ProfileExponent float64
-	ProfileOffset   float64
+  -bitmap-exponent float64
+    zipf exponent parameter for bitmap IDs
+
+  -bitmap-offset float64
+    zipf offset parameter for bitmap IDs
+
+  -profile-exponent float64
+    zipf exponent parameter for profile IDs
+
+  -profile-offset float64
+    zipf offset parameter for profile IDs
 
 	-client-type string
 		Can be 'single' (all agents hitting one host) or 'round_robin'