diff --git a/validator_manager/src/move_validators.rs b/validator_manager/src/move_validators.rs
index 19074de5cc3..4b06fea1de4 100644
--- a/validator_manager/src/move_validators.rs
+++ b/validator_manager/src/move_validators.rs
@@ -69,7 +69,8 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
         .about(
             "Uploads validators to a validator client using the HTTP API. The validators \
                 are defined in a JSON file which can be generated using the \"create-validators\" \
-                command.",
+                command. This command only supports validators signing via a keystore on the local \
+                file system (i.e., not Web3Signer validators).",
         )
         .arg(
             Arg::with_name(SRC_VC_URL_FLAG)