diff --git a/README.md b/README.md
index 2fcef1e..2809672 100644
--- a/README.md
+++ b/README.md
@@ -2053,15 +2053,22 @@ view would leave a wallet one click from deletion.
       fee estimate and the contract and never-sent recipient checks ask that
       network's RPC endpoint, and the Etherscan label check asks that network's
       explorer
-    - "Sign & Send" (correct password) when the gas limit, a fee per gas or the
-      total fee the RPC endpoint fills in at signing is over its bound in
-      `assertWithinCeilings()` (`src/shared/approvalVerify.js`) → nothing is
-      signed; "The gas limit or fee the RPC endpoint quoted for this transaction
-      is more than this wallet will sign for, so it was not sent. Please go back
-      and try again." in its own box, the same sentence for all three, no screen
-      change
-    - "Sign & Send" (wrong password) → "Wrong password." on the password error
-      line, no screen change
+    - "Sign & Send" (correct password) when the gas limit or a fee is over its
+      bound → nothing is signed; "The gas limit or fee the RPC endpoint quoted
+      for this transaction is more than this wallet will sign for, so it was not
+      sent. Please go back and try again." in its own box, no screen change. For
+      an ETH amount that Send's "Max" filled in, the gas limit and fees are
+      those of this screen's own fee estimate (see Amount above). For any other
+      send, the RPC endpoint fills in the gas limit and fees at signing.
+      `assertWithinCeilings()` (`src/shared/approvalVerify.js`) checks the
+      transaction just before it is signed. The check refuses the send with the
+      sentence above when any of these is over its bound:
+        - the gas limit
+        - each fee per gas the transaction sets
+        - the total fee: the gas limit times `maxFeePerGas`, or times `gasPrice`
+          when the transaction has no `maxFeePerGas`
+    - "Sign & Send" (wrong password) → "That password is incorrect. Please try
+      again." on the password error line, no screen change
     - "Sign & Send" signs as the From address above, not as whichever address is
       selected: the two are saved separately, so the popup can reopen onto this
       screen with another address selected. When the selected wallet does not