diff --git a/CHANGELOG.md b/CHANGELOG.md
index c55958c..8a7b677 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 ## [2018.09.05]
 
 ### Added
-- A `-p,--playground` option to the `install` command to install dependencies to an Xcode Playground instead of an SPM project. 
+- A `-p,--playground` option to the `install` command to install dependencies to an Xcode Playground instead of an SPM project. Playground installs do not support packages the use C module maps.
 - `-t,--targets` flag to the `install` command, which specifies which targets the new dependency will be added to.
 
 ## [2018.08.11]
diff --git a/Sources/Ether/Install/Install.swift b/Sources/Ether/Install/Install.swift
index 1947eeb..745e650 100644
--- a/Sources/Ether/Install/Install.swift
+++ b/Sources/Ether/Install/Install.swift
@@ -46,7 +46,8 @@ public final class Install: Command {
         #if !os(Linux)
         self.options.append(
             CommandOption.value(name: "playground", short: "p", help: [
-                "The name of the playground to install the package to, if you want to install the package to a playground."
+                "The name of the playground to install the package to, if you want to install the package to a playground",
+                "Dependencies that use C module maps are note yet supported. This includes packages such as Swift NIO"
             ])
         )
         #endif