primitive function and modifier help pages

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diff --git a/help/!assert assertwithmsg.md b/help/!assert assertwithmsg.md
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+Exclamation Mark (`!`)
+
+`! 𝕩`: Assert
+
+Throw an error if `𝕩` is not 1.
+```
+   ! 1
+1
+   ! 2
+Error: Assertion error
+at ! 2
+   ^
+   ! "hello"
+Error: hello
+at ! "hello"
+```
+
+`𝕨 ! 𝕩`: Dyad
+
+Throw an error with message `𝕨` if `𝕩` is not 1.
+```
+   "hi" ! 1
+1
+   "two" ! 2
+Error: two
+at "two" ! 2
+         ^
+   "hello error" ! "hello"
+Error: hello error
+at "hello error" ! "hello"
+```
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