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diff --git a/help/assert_assertwithmessage.md b/help/assert_assertwithmessage.md
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+*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/assert_assertwithmessage.html).*
+
+# Exclamation Mark (`!`)
+    
+## `! 𝕩`: Assert
+    
+Throw an error if `𝕩` is not 1.
+    
+           ! 1
+
+           ! 2
+
+           ! "hello"
+
+
+    
+    
+## `𝕨 ! 𝕩`: Dyad
+    
+Throw an error with message `𝕨` if `𝕩` is not 1.
+    
+           "hi" ! 1
+
+           "two" ! 2
+
+           "hello error" ! "hello"
+
+
+