diff --git a/Library/Homebrew/cmd/update.sh b/Library/Homebrew/cmd/update.sh
index cf8aa8879b..810fbb5617 100644
--- a/Library/Homebrew/cmd/update.sh
+++ b/Library/Homebrew/cmd/update.sh
@@ -30,6 +30,10 @@ git_init_if_necessary() {
     trap '{ rm -rf .git; exit 1; }' EXIT
     git init
     git config --bool core.autocrlf false
+    if [[ "$HOMEBREW_DEFAULT_BREW_GIT_REMOTE" != "$HOMEBREW_BREW_GIT_REMOTE" ]]
+    then
+      echo "HOMEBREW_BREW_GIT_REMOTE set: using $HOMEBREW_BREW_GIT_REMOTE for Homebrew/brew Git remote URL."
+    fi
     git config remote.origin.url "$HOMEBREW_BREW_GIT_REMOTE"
     git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"
     latest_tag="$(git ls-remote --tags --refs -q origin | tail -n1 | cut -f2)"
@@ -48,6 +52,10 @@ git_init_if_necessary() {
     trap '{ rm -rf .git; exit 1; }' EXIT
     git init
     git config --bool core.autocrlf false
+    if [[ "$HOMEBREW_DEFAULT_CORE_GIT_REMOTE" != "$HOMEBREW_CORE_GIT_REMOTE" ]]
+    then
+      echo "HOMEBREW_CORE_GIT_REMOTE set: using $HOMEBREW_CORE_GIT_REMOTE for Homebrew/core Git remote URL."
+    fi
     git config remote.origin.url "$HOMEBREW_CORE_GIT_REMOTE"
     git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"
     git fetch --force --depth=1 origin refs/heads/master:refs/remotes/origin/master
@@ -397,6 +405,7 @@ EOS
   if [[ "$HOMEBREW_DEFAULT_BREW_GIT_REMOTE" != "$HOMEBREW_BREW_GIT_REMOTE" ]]
   then
     safe_cd "$HOMEBREW_REPOSITORY"
+    echo "HOMEBREW_BREW_GIT_REMOTE set: using $HOMEBREW_BREW_GIT_REMOTE for Homebrew/brew Git remote."
     git remote set-url origin "$HOMEBREW_BREW_GIT_REMOTE"
     git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"
     latest_tag="$(git ls-remote --tags --refs -q origin | tail -n1 | cut -f2)"
@@ -407,6 +416,7 @@ EOS
      [[ -d "$HOMEBREW_LIBRARY/Taps/homebrew/homebrew-core" ]]
   then
     safe_cd "$HOMEBREW_LIBRARY/Taps/homebrew/homebrew-core"
+    echo "HOMEBREW_CORE_GIT_REMOTE set: using $HOMEBREW_CORE_GIT_REMOTE for Homebrew/brew Git remote."
     git remote set-url origin "$HOMEBREW_CORE_GIT_REMOTE"
     git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*"
     git fetch --force --depth=1 origin refs/heads/master:refs/remotes/origin/master
diff --git a/Library/Homebrew/tap.rb b/Library/Homebrew/tap.rb
index 4f62b3febf..b5c8550263 100644
--- a/Library/Homebrew/tap.rb
+++ b/Library/Homebrew/tap.rb
@@ -648,6 +648,15 @@ class CoreTap < Tap
     safe_system HOMEBREW_BREW_FILE, "tap", instance.name
   end
 
+  def install(options = {})
+    if HOMEBREW_CORE_GIT_REMOTE != default_remote
+      puts "HOMEBREW_CORE_GIT_REMOTE set: using #{HOMEBREW_CORE_GIT_REMOTE} " \
+           "for Homebrew/core Git remote URL."
+      options[:clone_target] ||= HOMEBREW_CORE_GIT_REMOTE
+    end
+    super(options)
+  end
+
   # @private
   def uninstall
     raise "Tap#uninstall is not available for CoreTap"