diff --git a/README.md b/README.md
index 434e0dc..39977b7 100644
--- a/README.md
+++ b/README.md
@@ -37,13 +37,13 @@ already on your `PATH`.
 
 ### Curl
 
-Run the below command to download the 1.4.0 binary and add it to
+Run the below command to download the 1.5.0 binary and add it to
 `/usr/local/bin`.
 
 #### Linux
 
 ```console
-curl -LO https://github.com/WillJCJ/param/releases/download/1.4.0/param-linux-amd64 && \
+curl -LO https://github.com/WillJCJ/param/releases/download/1.5.0/param-linux-amd64 && \
 chmod +x param-linux-amd64 && \
 sudo mv param-linux-amd64 /usr/local/bin/param
 ```
@@ -51,7 +51,7 @@ sudo mv param-linux-amd64 /usr/local/bin/param
 #### MacOS
 
 ```console
-curl -LO https://github.com/WillJCJ/param/releases/download/1.4.0/param-darwin-amd64 && \
+curl -LO https://github.com/WillJCJ/param/releases/download/1.5.0/param-darwin-amd64 && \
 chmod +x param-darwin-amd64 && \
 sudo mv param-darwin-amd64 /usr/local/bin/param
 ```
@@ -60,6 +60,10 @@ sudo mv param-darwin-amd64 /usr/local/bin/param
 
 Make sure your terminal session has the correct AWS credentials.
 
+Below is a brief overview for each command.
+Full docs for each command can be found at [`/docs`](docs/param.md).
+
+
 ### Copy
 
 Copy a parameter to your clipboard:
@@ -98,6 +102,26 @@ prefix1.prod.password
 prefix2.key
 ```
 
+### Set
+
+Set a parameter with type `SecureString`:
+
+```console
+$ param set parameter_name password123
+```
+
+If the parameter already exists, you must specify the `-f` flag
+to overwrite it:
+
+```console
+$ param set parameter_name password456 -f
+```
+
+#### Auto-completion
+
+With shell completion enabled, you can press tab to auto-complete the parameter
+names.
+
 ### Show
 
 If you'd like to print out the decrypted parameter without copying it the
@@ -160,9 +184,9 @@ export PARAM_NO_CACHE=1
 
 ## Docs
 
-Docs for each command can be found at [`/docs`](docs/param.md)
+Docs for each command can be found at [`/docs`](docs/param.md).
 
-They are automatically generated by Cobra.
+They are generated by Cobra by running `go run build/generate_docs.go`.
 
 ## CI
 
@@ -172,16 +196,18 @@ a new tag is pushed to GitHub.
 ## TODO
 
 - New Commands
-	- Set command - Command to set parameters
 	- Delete command - Command to delete parameters
+		- Maybe with a `--yes` flag to confim.
 - Improvements
 	- Add a flag to specify parameter type.
 	Currently only works with `SecureString`s.
+	- Better logging and a verbose option to see what calls are made to AWS.
 - Shell Completion
 	- `zsh` completion doesn't seem to work.
 	- Update or delete the bash completion cache after creating/deleting
 	parameters
 	- Add bash completion for other subcommands and flags.
+	- Command to reset the cache.
 - Write Tests
 - Improve Documentation
 	- More Examples
diff --git a/cmd/add.go b/cmd/add.go
deleted file mode 100644
index 13756a6..0000000
--- a/cmd/add.go
+++ /dev/null
@@ -1,21 +0,0 @@
-package cmd
-
-import (
-	"fmt"
-
-	"github.com/spf13/cobra"
-)
-
-var addCmd = &cobra.Command{
-	Use:   "add",
-	Short: "Add a paramter to Parameter Store.",
-	Long: `Add a paramter to Parameter Store.
-    Doesn't work yet.`,
-	Run: func(cmd *cobra.Command, args []string) {
-		fmt.Println("add called")
-	},
-}
-
-func init() {
-	RootCmd.AddCommand(addCmd)
-}
diff --git a/cmd/copy.go b/cmd/copy.go
index 6d7fe4a..502e87c 100644
--- a/cmd/copy.go
+++ b/cmd/copy.go
@@ -8,7 +8,7 @@ import (
 var verbose bool
 
 var copyCmd = &cobra.Command{
-	Use:   "copy parameter_name",
+	Use:   "copy name",
 	Short: "Copy a parameter to clipboard.",
 	Long:  "Copy the specified SSM Parameter from Paramter Store to your clipboard.",
 	Args:  cobra.ExactArgs(1),
diff --git a/cmd/list.go b/cmd/list.go
index 2f0db62..8921816 100644
--- a/cmd/list.go
+++ b/cmd/list.go
@@ -1,7 +1,6 @@
 package cmd
 
 import (
-	"fmt"
 	"strings"
 
 	"github.com/spf13/cobra"
@@ -16,7 +15,8 @@ var listCmd = &cobra.Command{
 	Long: `List all parameters from parameter store with an optional prefix.
     Results are sorted in alphabetical order.`,
 	Run: func(cmd *cobra.Command, args []string) {
-		listParameters()
+		prefixSlice := strings.Split(prefixes, ",")
+		param.List(prefixSlice)
 	},
 }
 
@@ -25,10 +25,3 @@ func init() {
 
 	listCmd.Flags().StringVarP(&prefixes, "prefix", "p", "", "Prefixes to fileter by")
 }
-
-func listParameters() {
-	prefixSlice := strings.Split(prefixes, ",")
-	for _, param := range param.DescribeParameters(prefixSlice) {
-		fmt.Println(param)
-	}
-}
diff --git a/cmd/root.go b/cmd/root.go
index bc4a299..8c4d2eb 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -101,7 +101,7 @@ const (
 
 __custom_func() {
     case ${last_command} in
-        param_copy | param_show)
+        param_copy | param_set | param_show)
             __param_list
             return
             ;;
diff --git a/cmd/set.go b/cmd/set.go
new file mode 100644
index 0000000..8234e11
--- /dev/null
+++ b/cmd/set.go
@@ -0,0 +1,24 @@
+package cmd
+
+import (
+	"github.com/spf13/cobra"
+	"github.com/willjcj/param/pkg/param"
+)
+
+var force bool
+
+var setCmd = &cobra.Command{
+	Use:   "set name value",
+	Short: "Set a paramter in Parameter Store.",
+	Long:  "Add a SecureString paramter to Parameter Store.",
+	Args:  cobra.ExactArgs(2),
+	Run: func(cmd *cobra.Command, args []string) {
+		param.Set(args[0], args[1], force)
+	},
+}
+
+func init() {
+	RootCmd.AddCommand(setCmd)
+	setCmd.Flags().BoolVarP(&force, "force", "f", false, "Overwrite the parameter if it exists.")
+
+}
diff --git a/docs/param.md b/docs/param.md
index 44766cf..f383a76 100644
--- a/docs/param.md
+++ b/docs/param.md
@@ -15,10 +15,10 @@ Param is a cli tool to improve interacting with AWS Parameter Store.
 
 ### SEE ALSO
 
-* [param add](param_add.md)	 - Add a paramter to Parameter Store.
 * [param completion](param_completion.md)	 - Generates shell completion scripts
 * [param copy](param_copy.md)	 - Copy a parameter to clipboard.
 * [param list](param_list.md)	 - List parameters in Parameter Store.
+* [param set](param_set.md)	 - Set a paramter in Parameter Store.
 * [param show](param_show.md)	 - Show a decrypted parameter in the console.
 
-###### Auto generated by spf13/cobra on 14-Jul-2018
+###### Auto generated by spf13/cobra on 15-Jul-2018
diff --git a/docs/param_completion.md b/docs/param_completion.md
index 4a0b1ab..c1b742c 100644
--- a/docs/param_completion.md
+++ b/docs/param_completion.md
@@ -36,4 +36,4 @@ param completion (bash|zsh) [flags]
 
 * [param](param.md)	 - Tools to improve Parameter Store on the command line.
 
-###### Auto generated by spf13/cobra on 14-Jul-2018
+###### Auto generated by spf13/cobra on 15-Jul-2018
diff --git a/docs/param_copy.md b/docs/param_copy.md
index 32c8f5f..e090eaa 100644
--- a/docs/param_copy.md
+++ b/docs/param_copy.md
@@ -7,7 +7,7 @@ Copy a parameter to clipboard.
 Copy the specified SSM Parameter from Paramter Store to your clipboard.
 
 ```
-param copy parameter_name [flags]
+param copy name [flags]
 ```
 
 ### Options
@@ -27,4 +27,4 @@ param copy parameter_name [flags]
 
 * [param](param.md)	 - Tools to improve Parameter Store on the command line.
 
-###### Auto generated by spf13/cobra on 14-Jul-2018
+###### Auto generated by spf13/cobra on 15-Jul-2018
diff --git a/docs/param_list.md b/docs/param_list.md
index a31965e..9d76874 100644
--- a/docs/param_list.md
+++ b/docs/param_list.md
@@ -28,4 +28,4 @@ param list [flags]
 
 * [param](param.md)	 - Tools to improve Parameter Store on the command line.
 
-###### Auto generated by spf13/cobra on 14-Jul-2018
+###### Auto generated by spf13/cobra on 15-Jul-2018
diff --git a/docs/param_set.md b/docs/param_set.md
new file mode 100644
index 0000000..7aa3145
--- /dev/null
+++ b/docs/param_set.md
@@ -0,0 +1,30 @@
+## param set
+
+Set a paramter in Parameter Store.
+
+### Synopsis
+
+Add a SecureString paramter to Parameter Store.
+
+```
+param set name value [flags]
+```
+
+### Options
+
+```
+  -f, --force   Overwrite the parameter if it exists.
+  -h, --help    help for set
+```
+
+### Options inherited from parent commands
+
+```
+      --config string   config file (default is $HOME/.param.yaml)
+```
+
+### SEE ALSO
+
+* [param](param.md)	 - Tools to improve Parameter Store on the command line.
+
+###### Auto generated by spf13/cobra on 15-Jul-2018
diff --git a/docs/param_show.md b/docs/param_show.md
index 8899b68..42f3eb0 100644
--- a/docs/param_show.md
+++ b/docs/param_show.md
@@ -26,4 +26,4 @@ param show parameter_name [flags]
 
 * [param](param.md)	 - Tools to improve Parameter Store on the command line.
 
-###### Auto generated by spf13/cobra on 14-Jul-2018
+###### Auto generated by spf13/cobra on 15-Jul-2018
diff --git a/pkg/param/list.go b/pkg/param/list.go
index 8ebae4f..d6c93bf 100644
--- a/pkg/param/list.go
+++ b/pkg/param/list.go
@@ -1,13 +1,20 @@
 package param
 
 import (
+	"fmt"
 	"sort"
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/service/ssm"
 )
 
-func DescribeParameters(prefixes []string) []string {
+func List(prefixes []string) {
+	for _, param := range describeParameters(prefixes) {
+		fmt.Println(param)
+	}
+}
+
+func describeParameters(prefixes []string) []string {
 	paramNames := []string{}
 	if len(prefixes) <= 0 {
 		paramNames = getAllParamNames()
@@ -32,6 +39,7 @@ func getParamNames(prefix string) []string {
 		Key:    aws.String("Name"),
 		Values: []*string{aws.String(prefix)},
 	}}
+
 	paramNames := []string{}
 	err := service.DescribeParametersPages(&ssm.DescribeParametersInput{
 		Filters: filters},
diff --git a/pkg/param/set.go b/pkg/param/set.go
new file mode 100644
index 0000000..133ae2f
--- /dev/null
+++ b/pkg/param/set.go
@@ -0,0 +1,23 @@
+package param
+
+import (
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/service/ssm"
+)
+
+func Set(name string, value string, force bool) {
+	putSecureStringParameter(name, value, force)
+}
+
+func putSecureStringParameter(name string, value string, overwrite bool) {
+	_, err := service.PutParameter(&ssm.PutParameterInput{
+		Name:      aws.String(name),
+		Type:      aws.String("SecureString"),
+		Value:     aws.String(value),
+		Overwrite: aws.Bool(overwrite),
+	})
+
+	if err != nil {
+		exitErrorf("Unable to set parameter, %v", err)
+	}
+}