diff --git a/implementations/micrometer-registry-signalfx/src/main/java/io/micrometer/signalfx/SignalFxMeterRegistry.java b/implementations/micrometer-registry-signalfx/src/main/java/io/micrometer/signalfx/SignalFxMeterRegistry.java
index d254f08136..2a4e9ff4ae 100644
--- a/implementations/micrometer-registry-signalfx/src/main/java/io/micrometer/signalfx/SignalFxMeterRegistry.java
+++ b/implementations/micrometer-registry-signalfx/src/main/java/io/micrometer/signalfx/SignalFxMeterRegistry.java
@@ -80,6 +80,7 @@ public SignalFxMeterRegistry(SignalFxConfig config, Clock clock) {
 
     public SignalFxMeterRegistry(SignalFxConfig config, Clock clock, ThreadFactory threadFactory) {
         super(config, clock);
+        logger.warn("SignalFxMeterRegistry is deprecated in favor of micrometer-registry-otlp.");
         this.config = config;
 
         URI apiUri = URI.create(config.uri());