diff --git a/Library/Homebrew/cask/cask_loader.rb b/Library/Homebrew/cask/cask_loader.rb
index a91882a6e5049..930ecc1d3a797 100644
--- a/Library/Homebrew/cask/cask_loader.rb
+++ b/Library/Homebrew/cask/cask_loader.rb
@@ -195,6 +195,8 @@ def initialize(url)
       def load(config:)
         path.dirname.mkpath
 
+        odeprecated "installing casks from paths or URLs", "installing casks from taps"
+
         if ALLOWED_URL_SCHEMES.exclude?(url.scheme)
           raise UnsupportedInstallationMethod,
                 "Non-checksummed download of #{name} formula file from an arbitrary URL is unsupported! " \
diff --git a/Library/Homebrew/formulary.rb b/Library/Homebrew/formulary.rb
index 67ae6b78ad7c7..0a1d42b49f688 100644
--- a/Library/Homebrew/formulary.rb
+++ b/Library/Homebrew/formulary.rb
@@ -728,6 +728,8 @@ def initialize(url, from: nil)
       uri_path = URI(url).path
       raise ArgumentError, "URL has no path component" unless uri_path
 
+      odeprecated "installing formulae from paths or URLs", "installing formulae from taps"
+
       formula = File.basename(uri_path, ".rb")
       super formula, HOMEBREW_CACHE_FORMULA/File.basename(uri_path)
     end