diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 58d3f83f21..683c12df03 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,3 +1,6 @@
+#### 0.22.12 - 14.01.2015
+* BUGFIX: `paket add` offered to add dependencies even when they are already added - https://github.com/fsprojects/Paket/issues/550
+
 #### 0.22.11 - 14.01.2015
 * BUGFIX: Detect `Net20-client` - https://github.com/fsprojects/Paket/issues/547
 
diff --git a/src/Paket.Core/ProjectFile.fs b/src/Paket.Core/ProjectFile.fs
index f479c08084..c1a7dfc608 100644
--- a/src/Paket.Core/ProjectFile.fs
+++ b/src/Paket.Core/ProjectFile.fs
@@ -82,8 +82,8 @@ type ProjectFile =
         match ProjectFile.FindReferencesFile proj with
         | None -> false
         | Some fileName -> 
-            let lines = File.ReadAllLines(fileName)
-            lines |> Seq.exists (fun l -> l.ToLower() = package.ToString().ToLower())
+            let referencesFile = ReferencesFile.FromFile fileName
+            referencesFile.NugetPackages |> Seq.exists (fun p -> NormalizedPackageName p = package)
 
     member this.CreateNode(name, text) = 
         let node = this.CreateNode(name)
diff --git a/src/Paket.Core/ReferencesFile.fs b/src/Paket.Core/ReferencesFile.fs
index 86ef15c60a..2745d6d4fd 100644
--- a/src/Paket.Core/ReferencesFile.fs
+++ b/src/Paket.Core/ReferencesFile.fs
@@ -55,6 +55,15 @@ type ReferencesFile =
             tracefn "Adding %s to %s" referenceName (this.FileName)
             { this with NugetPackages = this.NugetPackages @ [packageName] }
 
+    member this.RemoveNuGetReference(packageName : PackageName) =
+        let (PackageName referenceName) = packageName
+        let normalized = NormalizedPackageName packageName
+        if this.NugetPackages |> Seq.exists (fun p -> NormalizedPackageName p = normalized) |> not then
+            this
+        else
+            tracefn "Removing %s from %s" referenceName (this.FileName)
+            { this with NugetPackages = this.NugetPackages |> List.filter (fun p -> NormalizedPackageName p <> normalized) }
+
     member this.Save() =
         File.WriteAllText(this.FileName, this.ToString())
         tracefn "References file saved to %s" this.FileName
diff --git a/src/Paket.Core/RemoveProcess.fs b/src/Paket.Core/RemoveProcess.fs
index 456f25ca01..3f610d1b6c 100644
--- a/src/Paket.Core/RemoveProcess.fs
+++ b/src/Paket.Core/RemoveProcess.fs
@@ -9,18 +9,13 @@ let Remove(dependenciesFileName, package:PackageName, force, hard, interactive,
     let (PackageName name) = package
     let root = Path.GetDirectoryName dependenciesFileName
     let allProjects = ProjectFile.FindAllProjects root
-    for project in allProjects do
-        let proj = FileInfo(project.FileName)
-        match ProjectFile.FindReferencesFile proj with
-        | None -> ()
-        | Some fileName -> 
-            let lines = File.ReadAllLines(fileName)
-            let installed = lines |> Seq.exists (fun l -> l.ToLower() = name.ToLower())
-            if installed then
-                if (not interactive) || Utils.askYesNo(sprintf "  Remove from %s?" project.Name) then
-                    let newLines = lines |> Seq.filter (fun l -> l.ToLower() <> name.ToLower())
-                    File.WriteAllLines(fileName,newLines)
-
+    for project in allProjects do        
+        if project.HasPackageInstalled(NormalizedPackageName package) then
+            if (not interactive) || Utils.askYesNo(sprintf "  Remove from %s?" project.Name) then
+                ProjectFile.FindOrCreateReferencesFile(FileInfo(project.FileName))
+                    .RemoveNuGetReference(package)
+                    .Save()
+            
     // check we have it removed from all paket.references files
     let stillInstalled =
         allProjects
diff --git a/src/Paket/Paket.fsproj b/src/Paket/Paket.fsproj
index 406873f8d0..c5b722854e 100644
--- a/src/Paket/Paket.fsproj
+++ b/src/Paket/Paket.fsproj
@@ -28,7 +28,7 @@
     <DocumentationFile>
     </DocumentationFile>
     <StartArguments>update -f</StartArguments>
-    <StartArguments>add nuget NUnit -i</StartArguments>
+    <StartArguments>remove nuget nunit -i</StartArguments>
     <StartAction>Project</StartAction>
     <StartProgram>paket.exe</StartProgram>
     <StartWorkingDirectory>