diff --git a/instrumentation/excon/lib/opentelemetry/instrumentation/concerns/untraced_hosts.rb b/instrumentation/excon/lib/opentelemetry/instrumentation/concerns/untraced_hosts.rb
index cba3557ea..81acdd6a3 100644
--- a/instrumentation/excon/lib/opentelemetry/instrumentation/concerns/untraced_hosts.rb
+++ b/instrumentation/excon/lib/opentelemetry/instrumentation/concerns/untraced_hosts.rb
@@ -21,6 +21,9 @@ def self.included(klass)
           end
         end
 
+        # Checks whether the given host should be treated as untraced.
+        # If the current OpenTelemetry context is untraced, all hosts will be treated as untraced.
+        # The given host must be a String.
         def untraced?(host)
           OpenTelemetry::Common::Utilities.untraced? || untraced_host?(host)
         end