diff --git a/pkgs/build-support/fetchurl/default.nix b/pkgs/build-support/fetchurl/default.nix
index 7d23a3a7f8f1c..b0c001bdb7110 100644
--- a/pkgs/build-support/fetchurl/default.nix
+++ b/pkgs/build-support/fetchurl/default.nix
@@ -107,7 +107,7 @@ let
 
   hash_ =
     if hash != "" then { outputHashAlgo = null; outputHash = hash; }
-    else if md5 != "" then throw "fetchurl does not support md5 anymore, please use sha256 or sha512"
+    else if md5 != "" then throw "fetchurl does not support md5 anymore, please use hash (in SRI format), sha256 or sha512 attribute"
     else if (outputHash != "" && outputHashAlgo != "") then { inherit outputHashAlgo outputHash; }
     else if sha512 != "" then { outputHashAlgo = "sha512"; outputHash = sha512; }
     else if sha256 != "" then { outputHashAlgo = "sha256"; outputHash = sha256; }