diff --git a/.obsidian/workspace b/.obsidian/workspace
index c6ce18c..7f08798 100644
--- a/.obsidian/workspace
+++ b/.obsidian/workspace
@@ -88,6 +88,7 @@
   "active": "bc6e8ad9aa0f44c3",
   "lastOpenFiles": [
     "School/Analyse/Layers/1. Physical Layer.md",
+    "School/Analyse/Images/modulation-amplitude.png",
     "School/Analyse/Images/encoder.png",
     "School/Analyse/Network Types.md",
     "School/Analyse/Layers/5. Session Layer.md",
@@ -95,7 +96,6 @@
     "School/Analyse/Layers/7. Application Layer.md",
     "School/Analyse/Layers/4. Transport Layer.md",
     "School/Analyse/Layers/3. Network Layer.md",
-    "School/Analyse/Layers/2. Datalink Layer.md",
-    "School/Analyse/OSI Model.md"
+    "School/Analyse/Layers/2. Datalink Layer.md"
   ]
 }
\ No newline at end of file
diff --git a/School/Analyse/Images/modulation-amplitude.png b/School/Analyse/Images/modulation-amplitude.png
new file mode 100644
index 0000000..3257a9c
Binary files /dev/null and b/School/Analyse/Images/modulation-amplitude.png differ
diff --git a/School/Analyse/Layers/1. Physical Layer.md b/School/Analyse/Layers/1. Physical Layer.md
index 0303757..a187b0b 100644
--- a/School/Analyse/Layers/1. Physical Layer.md	
+++ b/School/Analyse/Layers/1. Physical Layer.md	
@@ -29,3 +29,16 @@ A encoder converts analog or digital information in signals that can be transmit
 The process of adding data to a carrier wave is called Modulation
 
 ## Modulation
+Adding data to carrier waves is called modulation.
+
+This can be done in 3 different ways.
+
+### Amplitude
+![[modulation-amplitude.png]]
+
+Amplitude or the strength (height) of a wave changes over time.
+We can change how much the amplitude is changing over a 
+
+### Frequency
+
+### Phase
\ No newline at end of file