diff --git a/README.md b/README.md
index 02607d9..d156aa2 100644
--- a/README.md
+++ b/README.md
@@ -99,7 +99,7 @@ forth.bindAsync("ip?", async () => {
 
 forth.interpret(`
 ( IP? callback. Called after IP address was received )
-: IP?-CB ( flag c-addr n -- )
+: IP?-CB ( true c-addr n | false -- )
   IF 
     ." Your IP address is " TYPE CR
   ELSE
diff --git a/src/web/examples/fetch/fetch.ts b/src/web/examples/fetch/fetch.ts
index 330953c..4cbe501 100644
--- a/src/web/examples/fetch/fetch.ts
+++ b/src/web/examples/fetch/fetch.ts
@@ -23,7 +23,7 @@ import WAForth from "waforth";
   // Load Forth code to bind the "ip?" call, and define the continuation callback
   forth.interpret(`
 ( IP? callback. Called after IP address was received )
-: IP?-CB ( flag c-addr n -- )
+: IP?-CB ( true c-addr n | false -- )
   IF 
     ." Your IP address is " TYPE CR
   ELSE