diff --git a/Cabal/src/Distribution/Simple/Setup/Config.hs b/Cabal/src/Distribution/Simple/Setup/Config.hs
index 4034602a578..2407329fc1b 100644
--- a/Cabal/src/Distribution/Simple/Setup/Config.hs
+++ b/Cabal/src/Distribution/Simple/Setup/Config.hs
@@ -779,7 +779,7 @@ configureOptions showOrParseArgs =
        , option
           ""
           ["promised-dependency"]
-          "A list of promised dependencies. E.g., --promised-dependency=\"void,0.1.1=void-0.5.8-177d5cdf20962d0581fe2e4932a6c309\""
+          "A list of promised dependencies. E.g., --promised-dependency=\"void-0.5.8=void-0.5.8-177d5cdf20962d0581fe2e4932a6c309\""
           configPromisedDependencies
           (\v flags -> flags{configPromisedDependencies = v})
           ( reqArg