diff --git a/README.md b/README.md
index 7ff48ea..f62f55d 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@
 
 ### Clustering Method
 
-A cluster is created when a certain number of points (=> `--size`) each are within a given distance (=> `--distance`) of at least one other point in the cluster. 
+A cluster is created when a certain number of points (defined with `--size`) each are within a given distance (defined with `--distance`) of at least one other point in the cluster. 
 
 
 ## Install
@@ -34,10 +34,10 @@ brew install proj gdal
 Usage: geoclustering [OPTIONS] FILENAME
 
   Tool to cluster geolocations. A cluster is created when a certain number of
-  points (--size) each are within a given distance (--distance) of at least
-  one other point in the cluster. Input is supplied as a csv file. At a
-  minimum, each row needs to have a 'lat' and a 'lon' column. Other rows are
-  reflected to the output.
+  points (defined with --size) each are within a given distance (defined with
+  --distance) of at least one other point in the cluster. Input is supplied as
+  a csv file. At a minimum, each row needs to have a 'lat' and a 'lon' column.
+  Other rows are reflected to the output.
 
 Options:
   -d, --distance FLOAT            (in km) Max. distance between two points in
@@ -58,7 +58,7 @@ Options:
 
 ## Input
 
-Inputs are supplied as a `.csv` file. The only required fields are `lat` and `lon`, all other fields are reflected to the output.
+Inputs are supplied as a `.csv` file. At a minimum, each row needs to have a `lat` and a `lon`` column. Other rows are reflected to the output.
 
 ```csv
 id,name,lat,lon
diff --git a/geoclustering/__main__.py b/geoclustering/__main__.py
index e9d1fc3..723c841 100644
--- a/geoclustering/__main__.py
+++ b/geoclustering/__main__.py
@@ -9,7 +9,7 @@ import geoclustering.io as io
 
 
 @click.command(
-    help="Tool to cluster geolocations. A cluster is created when a certain number of points (--size) each are within a given distance (--distance) of at least one other point in the cluster. Input is supplied as a csv file. At a minimum, each row needs to have a 'lat' and a 'lon' column. Other rows are reflected to the output."
+    help="Tool to cluster geolocations. A cluster is created when a certain number of points (defined with --size) each are within a given distance (defined with --distance) of at least one other point in the cluster. Input is supplied as a csv file. At a minimum, each row needs to have a 'lat' and a 'lon' column. Other rows are reflected to the output."
 )
 @click.option(
     "--distance",