diff --git a/Source/Houdini/README.md b/Source/Houdini/README.md
new file mode 100644
index 000000000..5e902df74
--- /dev/null
+++ b/Source/Houdini/README.md
@@ -0,0 +1,8 @@
+Houdini is annotation assistance system that can infer missing contracts.
+
+The original approach was implemented for ESC/Java, and is described in
+this paper:
+
+https://link.springer.com/chapter/10.1007/3-540-45251-6_29
+
+This project adapts that approach to Boogie programs.
diff --git a/Source/Provers/SMTLib/SMTLibInteractiveTheoremProver.cs b/Source/Provers/SMTLib/SMTLibInteractiveTheoremProver.cs
index 71f5ab872..e58b25eac 100644
--- a/Source/Provers/SMTLib/SMTLibInteractiveTheoremProver.cs
+++ b/Source/Provers/SMTLib/SMTLibInteractiveTheoremProver.cs
@@ -809,7 +809,7 @@ public override int GetRCount()
         {
           foreach (var relaxVar in relaxVars)
           {
-            var resp = await SendVcRequest("(get-value ({relaxVar}))").WaitAsync(cancellationToken);
+            var resp = await SendVcRequest($"(get-value ({relaxVar}))").WaitAsync(cancellationToken);
             if (resp == null)
             {
               break;