diff --git a/2024-01-31_OpenTelemetry_Looks_Good_To_Me/README.md b/2024-01-31_OpenTelemetry_Looks_Good_To_Me/README.md
index 2acf556b..edf96629 100644
--- a/2024-01-31_OpenTelemetry_Looks_Good_To_Me/README.md
+++ b/2024-01-31_OpenTelemetry_Looks_Good_To_Me/README.md
@@ -10,6 +10,10 @@ LGTM are a GrafanaLabs products initials and a joke for Loki, Grafana, Tempo and
 
 <iframe src="https://www.youtube.com/embed/1kgAzLYeKGY?si=dsrZowTsOmSJ1tsj" title="OpenTelemetry LGTM demo" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
 
+## Introduction
+Reference: https://o11y-weekly.github.io/2023-11-30_What_is_OpenTelemetry/
+A [previous post](https://o11y-weekly.github.io/2023-11-30_What_is_OpenTelemetry/) is available to explain what is OpenTelemetry while this post is focusing on how to use it and what is the outcome ?
+
 ## Naming conventions / Semantic-conventions
 References: 
 - https://opentelemetry.io/docs/concepts/semantic-conventions/
diff --git a/2024-01-31_OpenTelemetry_Looks_Good_To_Me/demo/compose.yml b/2024-01-31_OpenTelemetry_Looks_Good_To_Me/demo/compose.yml
index 57abd711..ed71a574 100644
--- a/2024-01-31_OpenTelemetry_Looks_Good_To_Me/demo/compose.yml
+++ b/2024-01-31_OpenTelemetry_Looks_Good_To_Me/demo/compose.yml
@@ -65,7 +65,8 @@ services:
       - SERVICE_NAME=service
       - SERVICE_NAMESPACE=demo
       - DEPLOYMENT_ENVIRONMENT=dev
-      - FAILURE_RATIO=0.0001
+      - FAILURE_RATIO=0.1 # demo parameter
+      - LATENCY_RATIO=1 # demo parameter
       - MIN_LATENCY=0 #ms
       - MAX_LATENCY=100 #ms
       - OTEL_TRACES_SAMPLER=parentbased_always_on
@@ -96,7 +97,7 @@ services:
       - SERVICE_NAMESPACE=demo
       - DEPLOYMENT_ENVIRONMENT=dev
       - OTEL_TRACES_SAMPLER=parentbased_traceidratio
-      - OTEL_TRACES_SAMPLER_ARG=1
+      - OTEL_TRACES_SAMPLER_ARG=0.1 # demo parameter
       - OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
       - OTEL_EXPORTER_OTLP_ENDPOINT=http://otelcontribcol-gateway:4318
       - OTEL_METRICS_EXPORTER=none
diff --git a/2024-01-31_OpenTelemetry_Looks_Good_To_Me/demo/otelcontribcol/gateway/pipeline.traces.yml b/2024-01-31_OpenTelemetry_Looks_Good_To_Me/demo/otelcontribcol/gateway/pipeline.traces.yml
index 4ac9779c..5fbe3a72 100644
--- a/2024-01-31_OpenTelemetry_Looks_Good_To_Me/demo/otelcontribcol/gateway/pipeline.traces.yml
+++ b/2024-01-31_OpenTelemetry_Looks_Good_To_Me/demo/otelcontribcol/gateway/pipeline.traces.yml
@@ -3,7 +3,7 @@ exporters:
     endpoint: otelcontribcol-traces-loadbalancer:4317
     tls:
       insecure: true
-  otlp/traces:
+  otlp/traces-collector:
     endpoint: otelcontribcol-traces-collector:4317
     tls:
       insecure: true
@@ -18,8 +18,9 @@ service:
     traces/gateway:
       receivers: [otlp/gateway]
       processors: [batch/traces-loadbalancer]
+      # demo parameter
       # choose one of : 
       # - otlp/traces-loadbalancer: forward to a loadbalancer collector over multiple tail sampling collectors
-      # - otlp/traces : forward to tail sampling collector 
+      # - otlp/traces-collector : forward to tail sampling collector 
       # - otlphttp/tempo: send traces to tempo directly without tail-sampling
       exporters: [otlp/traces-loadbalancer, debug]
\ No newline at end of file
diff --git a/2024-01-31_OpenTelemetry_Looks_Good_To_Me/slides/index.html b/2024-01-31_OpenTelemetry_Looks_Good_To_Me/slides/index.html
index 770a4b6b..6a9980d5 100644
--- a/2024-01-31_OpenTelemetry_Looks_Good_To_Me/slides/index.html
+++ b/2024-01-31_OpenTelemetry_Looks_Good_To_Me/slides/index.html
@@ -18,6 +18,16 @@
                   ![Looks Good To Me](./lgtm.png)
                 </textarea>
             </section>
+            <section data-markdown>
+              <textarea data-template>
+                  ### OpenTelemetry
+                  ![2023-11-30 #7 What is OpenTelemetry ?](o11y-weekly-otel-post-qrcode.gif)
+                  - OTLP protocol: gRPC/HTTP protobuf services
+                  - Semantic Conventions: attributes and resources
+                  - Instrumentations
+                  - Collectors / Exporters: SDK and agent
+              </textarea>
+            </section>
             <section data-markdown>
                 <textarea data-template>
                     ## Start up the demo !
diff --git a/2024-01-31_OpenTelemetry_Looks_Good_To_Me/slides/o11y-weekly-otel-post-qrcode.gif b/2024-01-31_OpenTelemetry_Looks_Good_To_Me/slides/o11y-weekly-otel-post-qrcode.gif
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