diff --git a/cspell.json b/cspell.json
index 8521501c..e115c5a7 100644
--- a/cspell.json
+++ b/cspell.json
@@ -50,6 +50,7 @@
     "opre",
     "oprune",
     "oref",
+    "peekable",
     "postcondition",
     "readback",
     "redex",