diff --git a/docs/dev/TechnicalDebt.md b/docs/dev/TechnicalDebt.md
index 3a1bae53f..0c250def6 100644
--- a/docs/dev/TechnicalDebt.md
+++ b/docs/dev/TechnicalDebt.md
@@ -21,6 +21,7 @@ Throughout the project, every function at every stage either **does exactly what
 ### Unknown function info
 
 - AudioIn and NpSessionSignaling exports added without an implementation have assumed signatures
+- `sceNetCtlGetIfStat` signature and 56-byte layout come from PPSA09030's call site and SharpProspero's `SceNetCtlIfStat`; the device kind is always 0, the byte counters are the host's totals over its up non-loopback hardware interfaces (not "since cleared"), and the not-connected result is assumed to match `sceNetCtlGetState`
 - Font, Http2, Net, Ssl, SystemService and libkernel exports imported by PPSA12544 and added without an implementation have unknown signatures
 - The Share, NpTrophy2, NpEntitlementAccess and WebBrowserDialog exports imported by PPSA12544's Unity plugins and added without an implementation have unknown signatures
 - Acm, GameLiveStreaming, Net, NpEntitlementAccess, NpManager, NpWebApi2, VoiceQoS, WebBrowserDialog and libkernel exports imported by PPSA14632 and added without an implementation are declared without parameters