More detail in a few help pages

1 files changed, 3 insertions, 1 deletions

diff --git a/help/depth.md b/help/depth.md
index 8c0d4367..bbe4d297 100644
--- a/help/depth.md
+++ b/help/depth.md
@@ -5,9 +5,11 @@
 ## `𝔽⚇𝕘 𝕩`, `𝕨 𝔽⚇𝕘 𝕩`: Depth
 [→full documentation](../doc/depth.md#the-depth-modifier)
 
-Apply `𝔽` to the cells of the arguments at depth given in `𝕘`.
+Apply `𝔽` to the cells of the arguments at depth given in `𝕘`. Negative numbers count down from the top level and non-negative ones from the bottom up.
 
 
         1⊸↓⚇1 ⟨⟨1,2,3⟩, ⟨4,5,6⟩⟩
 
         1 ↓⚇1 ⟨⟨1,2,3⟩, ⟨4,5,6⟩⟩
+
+        (+´↕)⚇0 ⟨2,4‿7,3⟩  # Implements pervasion