diff --git a/groth16.nimble b/groth16.nimble
index dde65c4..b5510f6 100644
--- a/groth16.nimble
+++ b/groth16.nimble
@@ -6,6 +6,7 @@ license     = "MIT OR Apache-2.0"
 skipDirs    = @["groth16/example"]
 binDir      = "build"
 namedBin    = {"cli/cli_main": "nim-groth16"}.toTable()
+installExt  = @["nim"]
 
 requires "nim >= 2.0.0"
 requires "https://github.com/status-im/nim-taskpools >= 0.0.5"
diff --git a/groth16/files/witness.nim b/groth16/files/witness.nim
index 381e85c..93a6159 100644
--- a/groth16/files/witness.nim
+++ b/groth16/files/witness.nim
@@ -32,6 +32,14 @@ type
     nvars*  : int
     values* : seq[Fr[BN254_Snarks]]
 
+func makeWitnessBN254*(vals: seq[Fr[BN254_Snarks]]): Witness = 
+  return Witness(
+      curve  : "bn128"
+    , r      : primeR
+    , nvars  : vals.len
+    , values : vals
+    )
+
 #-------------------------------------------------------------------------------
 
 proc parseSection1_header( stream: Stream, user: var Witness, sectionLen: int ) =