diff --git a/docs/archapi.md b/docs/archapi.md
index 869903e0..0d910f9e 100644
--- a/docs/archapi.md
+++ b/docs/archapi.md
@@ -367,7 +367,7 @@ Delay Methods
 
 ### delay\_t estimateDelay(WireId src, WireId dst) const
 
-Return an estimate for the total `maxDelay()` delay from the given src wire to
+Return a rough estimate for the total `maxDelay()` delay from the given src wire to
 the given dst wire.
 
 This should return a low upper bound for the fastest route from `src` to `dst`.
@@ -378,6 +378,11 @@ result, and for that estimate it is considered more accaptable to return a
 slightly too high result and it is considered less accaptable to return a
 too low result (thus "low upper bound").
 
+### delay\_t predictDelay(const NetInfo \*net\_info, const PortRef &sink) const
+
+Return a reasonably good estimate for the total `maxDelay()` delay for the
+given arc. This should return a low upper bound for the fastest route for that arc.
+
 ### delay\_t getDelayEpsilon() const
 
 Return a small delay value that can be used as small epsilon during routing.
@@ -397,6 +402,10 @@ Convert an `delay_t` to an actual real-world delay in nanoseconds.
 
 Convert a `delay_t` to an integer for checksum calculations.
 
+### delay\_t getBudgetOverride(const NetInfo \*net\_info, const PortRef &sink, delay\_t budget) const
+
+Overwrite or modify the timing budget for a given arc. Returns the new budget.
+
 Flow Methods
 ------------