diff --git a/bin/pyenv-virtualenv b/bin/pyenv-virtualenv
index 326e0b7..a0956c7 100755
--- a/bin/pyenv-virtualenv
+++ b/bin/pyenv-virtualenv
@@ -459,6 +459,9 @@ if [ -z "${EZ_SETUP_URL}" ]; then
 fi
 if [ -z "${GET_PIP_URL}" ]; then
   if [ -n "${PIP_VERSION}" ]; then
+    { colorize 1 "WARNING"
+      echo ": pip is going to abandon the support for the custom version installation via custom get-pip URL. The use of PIP_VERSION=${PIP_VERSION} may not work anymore."
+    } 1>&2
     GET_PIP_URL="https://raw.githubusercontent.com/pypa/pip/${PIP_VERSION}/contrib/get-pip.py"
     # Unset `PIP_VERSION` from environment before invoking `get-pip.py` to deal with "ValueError: invalid truth value" (pypa/pip#4528)
     unset PIP_VERSION