[2387] Add a code comment

diff --git a/src/lib/dns/rdata/generic/dnskey_48.cc b/src/lib/dns/rdata/generic/dnskey_48.cc
index 7e2faa0b9ab387dd433655c776551f0ecbe838c8..d1620fb6acba99c2c9d252fd39e5ada9e7d25d49 100644 (file)
--- a/src/lib/dns/rdata/generic/dnskey_48.cc
+++ b/src/lib/dns/rdata/generic/dnskey_48.cc
@@ -178,6 +178,8 @@ DNSKEY::constructFromLexer(MasterLexer& lexer) {
 
     lexer.ungetToken();
 
+    // Check that some key data was read before end of input was
+    // reached.
     if (keydatastr.size() == 0) {
         isc_throw(InvalidRdataText, "Missing DNSKEY digest");
     }