diff --git a/README.md b/README.md
index f11a1f34..a18a8608 100644
--- a/README.md
+++ b/README.md
@@ -112,7 +112,7 @@ resolution is obtained than by using a smaller _maxzoom_ or _detail_.
 
 ### Line and polygon simplification
 
- * -S _scale_ or --simplify=_scale_: Multiply the tolerance for line and polygon simplification by _scale_. The standard tolerance tries to keep
+ * -S _scale_ or --simplification=_scale_: Multiply the tolerance for line and polygon simplification by _scale_. The standard tolerance tries to keep
    the line or polygon within one tile unit of its proper location. You can probably go up to about 10 without too much visible difference.
 
 ### Doing more
diff --git a/man/tippecanoe.1 b/man/tippecanoe.1
index 78dead0b..c856cdb6 100644
--- a/man/tippecanoe.1
+++ b/man/tippecanoe.1
@@ -129,7 +129,7 @@ compensate for the larger marker, or \-rf\fInumber\fP to allow at most \fInumber
 .SS Line and polygon simplification
 .RS
 .IP \(bu 2
-\-S \fIscale\fP or \-\-simplify=\fIscale\fP: Multiply the tolerance for line and polygon simplification by \fIscale\fP\&. The standard tolerance tries to keep
+\-S \fIscale\fP or \-\-simplification=\fIscale\fP: Multiply the tolerance for line and polygon simplification by \fIscale\fP\&. The standard tolerance tries to keep
 the line or polygon within one tile unit of its proper location. You can probably go up to about 10 without too much visible difference.
 .RE
 .SS Doing more